De Black Knight Satelliet: Het Mysterie van de Vermeende 13.000 Jaar Oude Omloopbaan rond de Aarde Ontrafelen

Een artistieke impressie van de veronderstelde Black Knight-satelliet, het middelpunt van een langdurige samenzweringstheorie.

(Beeldbron: Future Plc/All About Space-magazine/Adrian Mann)

Inleiding

Het fenomeen van de Black Knight satelliet heeft al decennia lang de verbeelding van wetenschappers, space-enthousiastelingen en complotdenkers gevangen. Deze mysterieuze objecten in de ruimte worden vaak geassocieerd met oude, mogelijk buitenaardse technologie die al duizenden jaren in een polaire baan om de aarde zou cirkelen. Maar wat is er echt bekend over deze vermeende satelliet en hoe verhouden de wetenschappelijke feiten zich tot de mythen en theorieën? In dit artikel wordt het volledige verhaal ontrafeld, met grote aandacht voor de historische context, wetenschappelijke analyses, mediabeïnvloeding en de grote vraag: bestaat de Black Knight satelliet werkelijk, of is het slechts een modern mythologisch fenomeen?

De Oorsprong van het Mysterie

De eerste vermeldingen van de Black Knight satelliet stammen uit het begin van de 20e eeuw, toen Nikola Tesla in 1899 elektrische experimenten uitvoerde in Colorado Springs. Tijdens deze experimenten zou Tesla elektromagnetische signalen hebben opgevangen die hij beschreef als ritmische, kunstmatig lijkende radiogolven. Hoewel Tesla geen directe verwijzing maakte naar een satelliet, legde deze ontdekking de basis voor de latere speculaties.

Tesla’s signalen vertoonden een opvallende driedelige puls en werden herhaaldelijk opgemerkt in de maanden juli tot december 1899. Tesla geloofde dat deze signalen afkomstig waren van intelligente wezens, mogelijk van Mars of Venus, die contact probeerden te leggen met de aarde. Hoewel deze interpretaties later niet wetenschappelijk bevestigd werden, vormden ze de eerste aanwijzingen voor het bestaan van mysterieuze elektromagnetische uitingen uit de ruimte.

De Rol van Amateurs en de Opkomst van Satelliettracking

Ruim vóór de lancering van de Sovjetspuutnik in 1957, die de officiële start markeerde van het ruimtetijdperk, begonnen amateurs en ingenieurs wereldwijd radiogolven te onderscheppen. In de jaren 1920 en 1930 werden zogenaamde “Long Delayed Echoes” (LDEs) geregistreerd. Dit waren radiogolven die met vertragingen van enkele seconden tot zelfs meer dan een kwartier terugkeerden, wat niet verklaard kon worden door normale reflectie op de maan of atmosfeer.

Nederlandse en Scandinavische onderzoekers zoals Jørgen Hals en Carl Størmer noteerden deze ongebruikelijke echo’s en speculeerden over buitenaardse herkomst. Deze anomalieën werden later beschouwd als mogelijke bewijzen van oude, kunstmatige satellieten die de aarde al eeuwen of zelfs millennia bewaken. De theorie dat er een oude, artificiële satelliet in een polaire baan om de aarde zou cirkelen, kreeg hierdoor een wetenschappelijke onderbouwing uit de eerste observaties van ruimte-echo’s.

Pre-Sputnik Detecties en de Mystiek van Oude Artefacten

In de jaren 1950, nog vóór de officiële lancering van ruimtevaartuigen, werden verschillende waarnemingen gemeld van onbekende objecten in polar banen door militaire radarinstallaties en civiele waarnemers. Deze objecten vertoonden kenmerken die niet overeenkwamen met bekende satellieten of ruimtepuin: ze gingen in retrograde (tegen de draairichting van de aarde in), hadden hoge snelheden en vertoonden elektromagnetische signalen die niet te verklaren waren door natuurlijke oorzaken.

Sommige onderzoekers suggereerden dat deze objecten oude, buitenaardse artefacten konden zijn, mogelijk afkomstig uit een beschaving die duizenden jaren vóór ons had bestaan. De theorie dat een soort “oer-satelliet” al millennia in een baan om de aarde zou hangen, werd hierdoor verder aangejaagd.

De Koude Oorlog en de Verhulling van Onbekende Objecten

Tijdens de Koude Oorlog nam de interesse in ruimtewaarnemingen toe. De Amerikaanse en Sovjetmilitairen ontwikkelden geavanceerde radarsystemen om satellieten te volgen. Al snel werden onverklaarbare objecten opgemerkt die niet overeenkwamen met bekende satellietbanen: zij bewogen in retrograde, hadden hoge snelheden en vertoonden elektromagnetische kenmerken die niet door menselijke technologie verklaard konden worden.

In 1954, toen nog geen enkele natie officieel satellieten had gelanceerd, meldden Amerikaanse en Russische militaire bronnen de detectie van vreemde objecten in polaire banen. Dit leidde tot speculaties dat er al buitenaardse satellieten in de ruimte waren, of dat de aarde werd bewaakt door oude, misschien buitenaardse, kunstmatige objecten.

Een foto genomen door een astronaut tijdens de spaceshuttle-missie STS-88 in 1998 die volgens complottheoretici de 'Black Knight' toont.

(Beeldkrediet: NASA)

De Opkomst van de Media en de Mythologie

In de jaren 1960, na de lancering van de eerste kunstmatige satellieten, bleef het mysterie bestaan. Fotografisch bewijs kwam via de ruimtevaart, zoals de beroemde foto’s van NASA’s STS-88 missie in 1998. Op deze foto’s werd een donker, onregelmatig object zichtbaar dat door velen werd geïnterpreteerd als een buitenaardse satelliet, mogelijk de zogenaamde Black Knight.

De media speelden een grote rol in het versterken van het mythologische karakter: beelden werden digitaal versterkt, en verhalen over oude, mysterieuze objecten in de ruimte werden populair op internet en in documentaires. Zo werd de Black Knight een symbool voor een eeuwenoud buitenaards toezicht, dat mogelijk al sinds de ijzertijd in een baan om de aarde zou hangen.

De "Black Knight" is eigenlijk puin dat overbleef van een ruimtewandeling tijdens de eerste spaceshuttle-missie naar het Internationaal Ruimtestation in 1998.

(Beeldcredit: Future/Adrian Mann/Verbeterd in Canva door Daisy Dobrijevic)

De Wetenschappelijke Feiten en de Analyse van het Mysterie

Wat zegt de wetenschap over deze verhalen? Ondanks de fascinerende verhalen en de talrijke waarnemingen, wijst de feitelijke data op een andere realiteit.

1. Radarwaarnemingen en Space Debris

Sinds de jaren 1950 worden alle objecten in de baan om de aarde nauwkeurig gevolgd door systemen zoals het Amerikaanse NORAD en de ESA’s Space Surveillance and Tracking (SST). Deze systemen registreren duizenden objecten, van geslaagde satellieten tot stukjes ruimteafval. Het merendeel van de waargenomen objecten kan worden toegeschreven aan menselijke ruimtevaart, zoals raketonderdelen, afgedankte satellieten en ruimtepuin.

2. Fotografisch Bewijs en Photometrie

De beroemde foto’s van de NASA-ruimtevaart, inclusief die van de STS-88 missie, tonen vaak objecten die later worden verklaard als losgeraakte isolatiemateriaal of ruimtepuin. Digitale beeldanalyse en fotometrische technieken laten zien dat veel van de vermeende “mystieke” objecten eenvoudige reflecterende materialen zijn, niet buitenaardse constructies.

3. Radio- en Signaalaanvallen

De radiogolven die Tesla en anderen in de vroege 20e eeuw opmerkten, kunnen verklaard worden door natuurlijke atmosferische en ionosferische fenomenen, zoals reflectie op de ionosfeer of elektromagnetische verstoringen door zonne-activiteit. Vertragingen en echo’s worden nu goed begrepen als gevolg van ionosferische reflecties en golfflectie, niet als communicatie van buitenaardse probes.

4. Orbitalmechanica en de Onmogelijkheid van Eeuwenlange Satellieten

Volgens de wetten van de beweging en de atmosfeer zouden een kunstmatige satelliet die al 13.000 jaar in een stabiele baan zou hangen, onmogelijk zijn zonder voortdurende correcties. Atmosferische weerstand, gravitatie- en zonnestralingsdruk zorgen ervoor dat objecten in lage banen binnen enkele honderden tot duizend jaar naar de aarde vallen of verbranden. Een satelliet van die leeftijd kan niet bestaan zonder geavanceerde voortstuwingssystemen, die nog niet bekend zijn uit de prehistorie.

Wat is de Black Knight Satelliet? 

Hoe verklaar je dan de waargenomen anomalieën? 

Het antwoord ligt in natuurlijke en menselijke oorzaken: ruimtepuin, reflecties van de ionosfeer, en zelfs menselijke satellieten en ruimteafval dat verkeerd geïnterpreteerd wordt.

• De rol van media en mythologie

De media hebben een grote invloed gehad op de perceptie van de Black Knight. Documentaires, internetfora en YouTube-video’s versterken de mythe, vaak met digitale manipulaties of onjuiste interpretaties van foto’s en signalen. Populair-wetenschappelijke programma’s zoals “Ancient Aliens” hebben het idee van een oude, buitenaardse bewaker versterkt, ondanks het ontbreken van tastbaar bewijs.

• De invloed van oude mythes en de archeologie

Veel theorieën verbinden de Black Knight met oude beschavingen en mythologische verhalen. Bijvoorbeeld, de Nazca-lijnen en de bijbelse Ezekiel’s wagen worden geïnterpreteerd als bewijzen van buitenaardse technologie. Echter, archeologische en historische studies tonen dat deze symbolen en verhalen culturele interpretaties zijn, niet bewijs van buitenaardse aanwezigheid.

• De rol van moderne technologie en het internet

In de digitale tijdperk worden mythes snel verspreid en versterkt door sociale media en online gemeenschappen. Amateur-astronomen en UFO-enthousiastelingen delen waarnemingen, foto’s en theorieën. Soms worden echte ruimtewaarnemingen door space agencies verkeerd geïnterpreteerd of bewust overgeëxagereerd om het mysterie levend te houden.

• Wetenschappelijke consensus

De overgrote meerderheid van de wetenschappelijke gemeenschap is het erover eens dat er geen bewijs is voor een oude, buitenaardse satelliet die al 13.000 jaar in een baan om de aarde zou hangen. De waargenomen anomalieën kunnen worden verklaard door natuurlijke fenomenen en menselijke activiteiten.

Samenvatting en conclusie

Hoewel het verhaal van de Black Knight satelliet fascinerend is en een rijke mythologie bevat, wijst de wetenschap op een andere realiteit. De waarnemingen en foto’s worden toegeschreven aan ruimtepuin, natuurlijke elektromagnetische fenomenen en misinterpretaties. Het idee dat er al eeuwenlang een oude buitenaardse bewaker in een baan om de aarde zou hangen, wordt door de fysica onmogelijk gemaakt.

Het verhaal van de Black Knight blijft een boeiend cultureel fenomeen, dat de menselijke drang naar het onbekende en het buitenaardse weerspiegelt. Het vormt een bewijs van hoe mythes, media en technologie elkaar kunnen versterken, en hoe belangrijk kritisch denken en wetenschappelijke bewijsvoering zijn in het onderscheiden van feit en fictie.

Bronnen en verdere lezing

• Bauer, L. A. (1954). Radar reports of satellites. Aviation Week & Space Technology.
• Seifer, M. J. (1998). Wizard: The life and times of Nikola Tesla. Citadel Press.
• Tarter, J. (2001). The search for extraterrestrial intelligence (SETI). Annual Review of Astronomy and Astrophysics.
• Crutzen, P. J., & Stoermer, E. F. (2000). The Anthropocene. Global Change Newsletter.
• NASA. (1999). Foto’s en rapporten van de STS-88 missie.
• European Space Agency (ESA). (2020). Space debris: Monitoring and management.
• National Aeronautics and Space Administration (NASA). (2018). Technosignatures roadmap.

Samenvatting

De Black Knight satelliet is een krachtig cultureel symbool dat voortkomt uit een combinatie van historische waarnemingen, wetenschappelijke anomalieën en mediabeïnvloeding. Hoewel het een intrigerend verhaal blijft dat de menselijke verbeelding prikkelt, is er geen wetenschappelijk bewijs dat het object bestaat zoals het wordt voorgesteld in complottheorieën. In plaats daarvan biedt het een waardevol inzicht in de kracht van mythes en de noodzaak van kritisch wetenschappelijk denken in een wereld vol informatie en desinformatie.

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06-03-2026 om 22:21 geschreven door peter  

Inside the Government’s 80-Year UFO and Alien Cover-Up

{ https://galaxy.ai/ }

06-03-2026 om 21:33 geschreven door peter  

Self-Repairing Spacecraft Could Revolutionize Space Travel: Here’s How

ESA’s self-repairing spacecraft technology promises to revolutionize space exploration by reducing mission costs and enhancing spacecraft durability.

Written by Lydia Amazouz

© Credit: CompPair

The European Space Agency (ESA) is working on an innovative self-repairing spacecraft technology. This project, created in collaboration with Swiss companies CompPair and CSEM and Belgian firm Com&Sens, focuses on developing a self-healing composite material for space transportation systems. This material, HealTech, is capable of autonomously repairing damage that may occur during space missions. It promises to enhance spacecraft durability, reduce mission costs, and ensure a more sustainable approach to space exploration.

The Technology Behind HealTech: A Self-Repairing Composite

At the heart of this development is a specially designed composite material, which combines carbon fiber reinforced polymers with advanced self-healing properties. As highlighted by the ESA, composite materials are increasingly used in spacecraft because of their strength, lightness, and resistance to corrosion. However, they are also vulnerable to damage, especially when subjected to repeated stresses or impacts during space missions. HealTech has been designed to address these vulnerabilities by incorporating an autonomous repair system. The composite material contains a healing agent that activates when the material is heated, enabling it to repair cracks and minor damages.

Holding Cassandra test panel.
Credit: CompPair

The key to HealTech’s effectiveness lies in the integration of sensors and a heating element into the material. These sensors monitor the structural integrity of the spacecraft and detect damage early on. Once a crack or microfracture is identified, the material is heated through an integrated system of 3D-printed aluminum grids. The heat activates the healing agent inside the composite, allowing the material to self-repair. This self-healing process could significantly reduce the need for costly and time-consuming manual repairs during and after space missions.

Why HealTech Is a Game Changer for Space Transportation

One of the most exciting aspects of HealTech is its potential to transform space transportation. “Implementing this technology into our systems could have enormous benefits for space transportation,” says ESA’s Bernard Decotignie. “It will help develop reusable space infrastructure and reduce mission costs. This really proves what European innovation can do for the space sector.” With reusable launchers and spacecraft becoming an integral part of future space missions, the ability to repair materials autonomously could reduce maintenance costs and improve the longevity of these systems.

The technology could prove especially valuable for missions that involve frequent launches and landings, as it helps reduce the wear and tear that typically occurs with repeated use. In traditional space missions, spacecraft components often suffer from micro-cracking or other forms of stress damage. HealTech addresses these issues by providing a solution that allows spacecraft to repair themselves, thereby extending their operational life and reducing waste.

The Role of CompPair in Revolutionizing Spacecraft Materials

CompPair, the company responsible for developing HealTech, has been at the forefront of innovation in composite materials for space travel. According to Robin Trigueira, CompPair’s Chief Technology Officer, the development of HealTech represents a major leap forward for space technology.

“I’m excited by the autonomy and durability benefits we can bring for future spacecraft and launchers, closing the gap between science fiction and reality! This project is a major step for CompPair in the space sector,” he says. “HealTech is unlocking unprecedented technological advancement for composite material health monitoring and management, clearly highlighting the possibilities brought by healable composites for reusable space structure costs efficiency.”

CompPair’s technology not only promises to make spacecraft more durable but also more autonomous. This autonomous damage repair system will be critical for future space exploration missions, as it reduces the need for human intervention and ensures that spacecraft can operate for longer periods in harsh space environments without the risk of critical damage.

Advancing Spacecraft Durability and Performance

The development of HealTech is not just about improving the repairability of spacecraft; it’s also about enhancing overall spacecraft performance. Cecilia Scazzoli, the Head of Research and Development for CompPair, highlights the potential of HealTech for ensuring the integrity of spacecraft during challenging missions. “I’m thrilled that we have demonstrated that HealTech composites with health monitoring and heating systems show autonomous damage sensing and healing and high resistance to micro-cracking. This makes them suited to the demanding requirements of propellant tanks and reusable space structures, and paves the way for lighter, more maintainable spacecraft components,” she explains.

The integration of self-healing technology into spacecraft could lead to the creation of lighter, more resilient spacecraft components that can withstand the extreme conditions of space travel. This could ultimately help to make space missions more cost-effective and sustainable, as spacecraft will require fewer repairs and replacements over time. The ability to maintain spacecraft in space without the need for frequent service missions or manual repairs could also make long-term missions, such as those to Mars or beyond, more feasible.

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{ https://dailygalaxy.com/category/space/ }

06-03-2026 om 17:46 geschreven door peter  

Scientists Have Just Successfully Grown Chickpeas in Lunar Soil for the First Time

Chickpeas are growing in lunar soil for the first time, but is this discovery the key to feeding astronauts on the Moon?

Written by Sarah Jones

© Credit: Shutterstock

Scientists have successfully grown chickpeas in soil that mimics the Moon’s surface. This exciting achievement, led by researchers at the University of Texas at Austin, could change the future of space travel by showing that astronauts might be able to grow their own food on the Moon during long missions.

As NASA prepares to send astronauts back to the Moon with its Artemis missions, one of the biggest challenges is how to feed them during extended stays. The new research shows that growing food on the Moon might actually be possible, with chickpeas becoming the first crop to thrive in a material designed to simulate lunar soil.

Growing in Simulated Moon Soil

Lunar regolith, the material covering the Moon’s surface, isn’t exactly plant-friendly. It’s made up of tiny particles that lack the organic matter and microorganisms plants need to grow on Earth. Not only that, but it also contains heavy metals that can be harmful to plants.

“The research is about understanding the viability of growing crops on the moon,” said Sara Santos, a postdoctoral fellow at the University of Texas Institute for Geophysics (UTIG), associated with the Jackson School of Geosciences. “How do we transform this regolith into soil? What kinds of natural mechanisms can cause this conversion?”

According to the study, published in the journal Scientific Reports, conducted by the University of Texas and Texas A&M University, simulating this environment on Earth was the first big challenge. To do so, the researchers used simulated moon dirt from Exolith Labs, which closely resembles the regolith brought back during the Apollo missions.

The relationship between chickpea plants (CP), arbuscular mycorrhizae (AMF), and vermicompost (VC) in the rhizosphere.

Credit: Scientific Reports

The next step was improving this moon dirt to make it more suitable for growing crops. The team added vermicompost, nutrient-rich material created by earthworms, to the mix. This helped give the chickpeas the nutrients they needed to grow, turning the sterile moon dirt into something much more plant-friendly.

Fungi Helped Chickpeas Survive Moon Soil

What really made this experiment stand out was the use of arbuscular mycorrhizal fungi. These fungi form a partnership with plant roots, helping them absorb nutrients and water, which is especially important in a harsh environment like simulated moon soil. The researchers coated the chickpea seeds with these fungi before planting them.

The results were promising. As stated in the latest research, chickpeas treated with the fungi survived much longer than those without it. The fungi also helped limit the uptake of harmful metals from the soil, which is a big deal when it comes to growing food on the Moon. Plus, the fungi stuck around in the simulated lunar soil, meaning they could potentially continue to support plant growth over time in future lunar farming systems.

Are Moon-Grown Chickpeas Safe to Eat?

While growing chickpeas on the Moon is an exciting step forward, there’s still a lot more to figure out. Scientists now face the task of determining if these chickpeas are safe to eat. They need to check if the plants absorbed any harmful metals from the soil and whether they’re nutritious enough for astronauts.

Jessica Atkin noted that, the first author of the study, the next phase of research will focus on analyzing the nutritional content of the crops. If everything checks out, this could pave the way for astronauts to grow their own food on the Moon.

“We want to understand their feasibility as a food source,” she said Jessica Atkin.“How healthy are they? Do they have the nutrients astronauts need? If they aren’t safe to eat, how many generations until they are?”

Right now, the scientists are taking a measured approach, advancing one step at a time. This study is just the starting point, with plenty of work ahead before crops grown in space can be a trusted food source for lunar explorers.

{ https://dailygalaxy.com/ }

06-03-2026 om 17:26 geschreven door peter  

Scientists Publish the First Direct Measurement of Space Debris Pollution

By Andy Tomaswick  

{ https://www.universetoday.com/ }

06-03-2026 om 16:54 geschreven door peter  

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06-03-2026 om 15:56 geschreven door peter  

Recently, the whole world’s attention has once again turned to our natural satellite. The Moon, which for decades was considered only a temporary stop on the way to distant worlds, suddenly found itself at the epicenter of global economic and technological strategies. Previously, mining minerals on another planet was considered science fiction, but today it is becoming a real business plan in which various companies are already investing.

Over the past year, there has been a significant paradigm shift in space exploration. Elon Musk, whose ambitions to colonize Mars have dominated media headlines for decades, has shifted his focus somewhat. In the near term, SpaceX is increasingly focusing on activities on the lunar surface. The idea is simple but ingenious: use local resources (regolith, ice, and minerals) to build large satellites and bases directly in space, instead of overcoming Earth’s gravity with heavy cargo each time.

A similar shift has taken place within NASA. Whereas previously the focus was on the Gateway orbital station, which was to orbit the Moon, the agency is now increasingly talking about building stationary elements of the base directly on the surface. This “lunar alliance” between the state and private capital has created ideal conditions for the emergence of a new generation of startups.

Duet of dreamers

In March 2026, two ambitious lunar startups, Astrolab and Interlune, officially announced a strategic partnership. Their goal is not just research, but the creation of a full-fledged industrial infrastructure on the Moon.

Astrolab, led by Jarrett Matthews, is developing universal transport platforms (rovers) that are set to become the “workhorses” for NASA and commercial customers. Interlune, led by former Blue Origin president Rob Meyerson, has set itself an even more ambitious goal: to become the first company in the world to extract helium-3 on the Moon.

The fuel of the future and treasure in regolith

Why is helium-3 causing such a stir? This isotope is practically non-existent on Earth in its natural state. Humankind obtains it as a by-product of nuclear reactors or the decay of radioactive substances. However, it has been accumulating on the Moon for billions of years, carried there by solar wind.

Scientists consider helium-3 to be the ideal fuel for future thermonuclear reactors – it can provide clean energy without dangerous radioactive emissions. However, even before the advent of commercial fusion, this resource is critically important. It is indispensable in cryogenic technology and quantum computing, where cooling to temperatures close to absolute zero is required. Interlune already has preliminary contracts to sell thousands of liters of this gas. There is only one problem: it needs to be delivered from the Moon.

The evolution of lunar rovers

The companies’ collaboration will begin with a small but confident step – the FLIP (Flexible Logistics and Exploration) mission. This is a small rover, about the size of a go-kart, which is scheduled to be launched to the Moon at the end of this year aboard Astrobotic’s Griffin landing module.

FLIP will carry a multispectral camera from Interlune on board. Its task is to scan the lunar soil (regolith) and confirm the data on the concentration of helium-3, which scientists previously obtained only on the basis of samples from the Apollo program. This will be the first real “geological exploration” with a focus on industrial extraction.

The next stage will be FLEX – a true giant among rovers. The size of a minivan, this rover has a unique horseshoe-shaped chassis. This design allows it to be the “Swiss Army knife” of space:

• Transport astronauts over long distances.
• Transport heavy equipment for base construction.
• Serve as a platform for the Interlune mobile harvester.

The versatility of FLEX lies in the fact that any payload can be placed under its body – from excavators to scientific laboratories.

Logistics and testing

The implementation of these plans is closely linked to the success of SpaceX Starship. The FLEX rover is expected to be part of one of Starship’s first unmanned missions to the Moon in 2027 or 2028. This will allow equipment of a size previously unimaginable to be delivered to the surface of the satellite.

In parallel with preparations for the flight, the companies have already begun ground tests. Prototype testing will take place at the new Space Institute at Texas A&M University in Houston. This facility, which is being built directly at the Johnson Space Center (NASA), will become the main testing ground for developing technologies for extracting resources in extraterrestrial conditions.

Why is this important for humanity?

The Astrolab and Interlune project is more than just another space mission. It marks the beginning of a transition from passive observation of space to active management of it. If humanity learns to extract energy and materials on the Moon, it will not only open the way to distant planets but also help solve energy and environmental problems on Earth itself.

Today, we are witnessing the birth of a new industry. Space harvesters are just around the corner, and the Moon seems ready to reveal its most precious secrets to those who dare to challenge the void.

We previously reported on how the prototype of a lunar excavator is ready to extract helium-3.

• Provided by arstechnica.com

• Posted in Business, News

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06-03-2026 om 15:48 geschreven door peter  

Imagine a satellite that repairs itself in space, removing microcracks. It sounds like science fiction. However, this could become a reality very soon if European engineers succeed in creating a device based on the self-repairing composite they have developed.

Self-healing material

At first glance, all spacecraft that do not encounter friction in a vacuum can operate practically forever. However, in reality, their structures, especially those made of composite materials, are constantly subjected to complex influences that can lead to their destruction.

But what if spacecraft could repair their own structure when microcracks are detected? This incredible idea may soon become a reality thanks to engineers from the Swiss company CompPair and CSEM and their colleagues at Com&Sens.

They are working on the Cassandra project for the European Space Agency. It involves integrating sensors and heating elements into the composite material. These elements are designed to teach it to heal itself.

Cracks in composite material

In general, composite materials are a very good option for spacecraft. They consist of a reinforcing element immersed in a matrix, which allows combining the advantages of both without their disadvantages. As a rule, these are carbon fibers in a polymer medium, which allows creating very light and strong structures.

However, sooner or later, microcracks will appear in any polymer material, begin to grow, and eventually destroy the entire element. This is precisely the problem that the Cassandra project aims to solve. The approach involves integrating not only reinforcing elements into the composite material, but also sensors and a metal mesh through which an electric current can be passed.

The idea is quite simple. If the sensors detect microcracks in the element, for example, due to a change in stress, current is supplied to the heating elements, which melts the material and closes the breach in integrity.

Research results

However, this is all in theory. In practice, engineers have only conducted initial tests. Various samples ranging in size from 2×10 to 40×40 cm were used for these tests. Damage was inflicted in a controlled manner, as the scientists were primarily interested in whether the sensors would respond adequately to it. However, resistance to thermal shock, i.e., sudden cooling, was also tested at the same time.

In principle, all tests can be considered successful. Microcracks were successfully eliminated. However, engineers did not check thermal stability for nothing. They understand that the technology can only be truly evaluated on a real part. Therefore, next time they will make an entire cryogenic tank out of them.

• Provided by: phys.org

• Posted in News, Tech

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06-03-2026 om 15:35 geschreven door peter  

Scientists from Tuskegee University, exploring conceptual light sails for interstellar travel, have demonstrated a photonic light-crystal sail design that is more efficient than earlier designs.

Based on the concept of directed energy propulsion, light sails propelled by massive lasers could accelerate unmanned probes to as fast as 20% the speed of light, enabling missions to nearby stars in a few decades rather than the hundreds of thousands of years conventional chemical rockets would need to reach Earth’s nearest stellar neighbor, Proxima Centauri.

The research team behind the proposed photonic crystal light sail suggests that their design could enable near-term interplanetary missions and potentially lead to longer-term interstellar missions to other star systems.

Light Sails Traveling at 20% Light Speed Could Reach Proxima Centauri in 20 Years

To reach space, humans rely exclusively on chemical rockets. To explore beyond Earth’s orbit, those rockets must carry additional fuel. However, adding fuel adds weight, necessitating even more fuel. Engineers have quantified this trade-off with a mathematical tool called the rocket equation.

While some emerging alternatives, such as electric propulsion, enable satellites to maneuver in orbit or even explore deep space, their low speeds also limit the distances they can travel within a human lifetime. The Debrief has covered some sci-fi-sounding alternatives, such as the Wind Rider plasma magnets and warp drives, but those options are either too slow or too theoretical to serve as viable interstellar propulsion systems.

More recently, researchers have explored the concept of light sails. Similar to the more well-known concept of solar sails that “sail” on the pressure of the solar wind, light sails use the energy from a light source to sail at increasingly faster speeds. This design removes the need for onboard propellant.

Some estimates, such as the proposed Breakthrough Starshot initiative, suggest that current technology could design a light-sail-equipped microprobe driven by a powerful laser capable of reaching up to 20% of the speed of light. At that speed, such a probe could reach Proxima Centauri in a little over 20 years.

Light sail by Masumi Shibata, courtesy of Breakthrough Initiatives

While a seemingly practical alternative to chemical propulsion, the practical application of light sails has been limited by engineering challenges. For example, current designs propose metal-coated polymer films. These materials offer a favorable combination of energy reflectivity and strength.

However, these designs also absorb some of the directed energy and convert it into heat. Efforts to capture this wasted heat by increasing reflectivity involve adding materials, thereby increasing weight. As a result, designers of light sails have encountered a tradeoff similar to the rocket equation.

How Photonic Light Crystal Sails Increase Reflectivity and Propulsion

According to a statement announcing the proposed photonic light crystal sail design, the sail’s structure consists of nanoscale patterns from three dielectric components. The first layer is composed of germanium pillars, the second of air holes, and the final layer of a polymer matrix.

Where conventional light sails are made of two material photonic structures, the three-layer dielectric material combination of high-index germanium pillars, low-index air voids, and the polymer host form a wavelength-selective photonic bandgap structure that the research team described as “optimized for propulsion-specific reflectivity.”

“This configuration establishes a narrow photonic band gap centered at the propulsion wavelength, resulting in high reflectivity within that spectral window while remaining largely transparent outside the designed band,” they explain.

The researchers attributed the exceptional reflectivity of their light sail design to nanoscale patterns in the dielectric materials that control light propagation. They also noted that the ability to arrange materials with different ‘refractive indices,” they were able to create a photonic gap, defined as “a range of wavelengths that cannot pass through the structure and are instead reflected.”

“By designing a narrow photonic band gap aligned with the propulsion laser frequency, the proposed sail can stay mostly transparent to ambient solar radiation while maintaining high reflectivity in the specific operating band,” explained study author Dimitar Dimitrov, an assistant professor at Tuskegee University.

Experiments Confirm Improved Sail Material Performance

To test the concept, the Tuskegee team designed a photonic crystal structure using plane-wave expansion and finite-difference time-domain simulations. After running several simulations, the team achieved approximately 90% reflectivity at a wavelength of 1.2 micrometers.

After the successful simulations, the team fabricated real-world ‘proof-of-concept’ material membranes, such as those used in light sails. Due to the delicate nature of the finished product, the team used electron-beam lithography and vacuum deposition.

“The membranes were fabricated using a sequential nanolithography and material infill process involving patterned polymer templating, selective germanium deposition, lift-off processing, and secondary electron-beam structuring,” they explained.

According to the team, this multi-step fabrication approach allowed them to create three-dielectric photonic crystal architectures “at the sub-200-nanometer scale.” The final versions of the fabricated structures contained 200-millimeter-wide germanium pillars and 400-nanometer-diameter air holes embedded in a 200-nanometer-thick polymer layer.

The team was able to confirm this level of precision engineering and nanoscale patterning with an electron microscope. Dimitrov said demonstrating the feasibility of constructing these precise, multi-dielectric crystal nanostructures was a “key continuation: of the team’s work.

“The results show that these can be engineered to combine low mass, strong wavelength selectivity, and scalable fabrication potential,” the researcher explained.

Devices for Laser-Driven propulsion Enabling Future Interplanetary Exploration

To see if light sails made with their process would maintain reflectivity in simulated spaceflight conditions, the researchers modeled a one-square-meter sail and illuminated it with a 100-kW laser. As hoped, these tests showed that their design could generate continuous thrust. These results also suggested that a light sail made with the three-dielectric material could accelerate a probe to “speeds of several hundred meters per second within one hour under idealized conditions.”

While this speed is far below what would be required for an interstellar mission, the researchers said it is also robust and reflective enough to enable light sails designed for interplanetary missions within our solar system to take a fraction of the time of current rocket-propelled missions. They also concede that further research will be needed before a photonic light crystal sail is deployed in space, while noting that their work “demonstrates a possible pathway from theoretical design to fabrication.”

“Despite current limitations, our research could serve as a foundation for the design and fabrication of multi-dielectric photonic crystal sails,” Dimitrov explained. “It may provide a pathway to experimentally validated, scalable, lightweight devices for laser-driven propulsion, enabling future interplanetary exploration with minimal onboard mass,”

• The study “Design and manufacture of a photonic crystal light sail” was published in the Journal of Nanophotonics.
• Christopher Plain is a Science Fiction and Fantasy novelist and Head Science Writer at The Debrief. Follow and connect with him on X, learn about his books at plainfiction.com, or email him directly at christopher@thedebrief.org

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