Tomorrow's liftoff, which you can watch live here on Space.com, will be action-packed for SpaceX. Shortly after launch, the company will attempt to land the first stage of the two-stage Falcon 9 on a robotic "drone ship" stationed in the Atlantic Ocean. SpaceX has already pulled off two dozen such first-stage landings, roughly half of them on drone ships. 

The company will also try to recover the payload fairing, the protective nose cone surrounding TESS during launch. But SpaceX won't use the net-equipped boat "Mr. Steven" to snatch the fairing halves out the sky tomorrow, Hans Koenigsmann, SpaceX vice president of build and flight reliability, said during today's briefing. Rather, the fairing halves will splash down in the ocean with the aid of parachutes, and the company will scoop them out of the water.

Such activities are part of SpaceX's effort to develop fully and rapidly reusable rockets and spacecraft, a breakthrough that company founder and CEO Elon Musk has said could slash the cost of spaceflight and help humanity spread its footprint out into the solar system.