Today (July 31), The Planetary Society announced mission success as LightSail 2 — the bread-loaf-sized, crowdfunded, solar-powered spacecraft orbiting Earth — officially raised its orbit with the power of sunlight alone.
"Today, we declare mission success — we're going to a higher orbital altitude without rocket fuel, just with the push of sunlight,"
Planetary Society CEO Bill Nye said in a press conference.
"This is a very exciting day for us and for me personally," Nye said in the conference. "This idea that you could fly a spacecraft and could get propulsion in space form nothing but photons, it's surprising, and for me, it's very romantic that you'd be sailing on sunbeams."
After LightSail 2 successfully deployed its solar sail last week, mission managers remotely optimized the craft's orientation. With these small changes, the craft began raising its orbit above our planet, raising its apogee, or orbital high point. Within the past four days, the craft has raised its apogee about 1.2 miles (2 kilometers). The mission team behind the craft confirmed that this orbital raising could be due to nothing other than successful solar sailing, or propulsion from photons, particles that transmit light, from the sun.

The Planetary Society’s LightSail 2 captured this picture of Earth’s limb on July 6, 2019, at 12:41 a.m. EDT from a camera mounted on its dual-sided solar panels. The spacecraft was headed into orbital sunset at the time, and the sun is visible to the right. The photo is unmodified and shows a number of lens flare artifacts caused by sunlight scattering around the camera optics. LightSail 2’s dual fisheye cameras have fields of view of about 180 degrees, causing the arcs in the corners and some distortion.
(Image credit: The Planetary Society)
With this accomplishment, LightSail 2 becomes the first spacecraft to be propelled by solar sailing in Earth orbit; the first small spacecraft to be propelled by solar sailing; and the second-ever spacecraft, after Japan's IKAROS mission, to successfully use solar sailing, The Planetary Society said.
On June 25, LightSail 2 launched from NASA's Kennedy Space Center aboard a SpaceX Falcon Heavy rocket. On July 2, the 11-lb. (5 kilograms) cubesat signaled to Earth, marking the spacecraft's successful arrival in low Earth orbit. On July 23, the craft successfully deployed its solar sail and early data showed that its small motor was rotating and it had begun to turn the sail to the sun. That maneuver facilitates an extra "push" from the sun once per orbit. So far, the craft has captured and sent home images of its stellar view and solar sail deployment.