It's all systems go for Monday night's SpaceX rocket launch from Cape Canaveral.
The private space company is blasting into space NASA's $337-million Transiting Exoplanet Survey Satellite, or TESS, which will search for thousands of planets orbiting other stars.
Astronomers hope TESS will find the potential for life to exist outside our solar system.
The 30-second launch window opens at 6:32 p.m. EST
SpaceX will try to land the Falcon 9 rocket's first stage on a ship offshore and recover the two halves of the nose cone, which will drop to the ocean by parachute.
The TESS mission is capped at $200 million, not including launch costs, which add $87 million to the final tally, NASA officials have said.
Visit Space.com for complete coverage of the launch.
A live webcast on the launch begins at 6 p.m.