The US space agency is about to launch a telescope that should find thousands of planets beyond our Solar System. From a report: The Tess mission will go up on a SpaceX's Falcon rocket from Cape Canaveral in Florida and survey nearly the entire sky over the course of the next two years. It will stare at stars, hoping to catch the dip in brightness as their faces are traversed by orbiting worlds. Tess will build a catalogue of nearby, bright stars and their planets that other telescopes can then follow up. Key among these will be the successor to Hubble -- the James Webb space observatory, due in orbit from 2020. Its powerful vision will have the capability to analyse the atmospheres of some of Tess's new worlds, to look for gases that might hint at the presence of life.
James Webb will "tease out the chemical compositions of those atmospheres and look for whatever's there," said Paul Hertz, the astrophysics director at Nasa. "People are very interested in looking for, what on Earth, are bio-signatures, such as methane, carbon dioxide, water vapour and oxygen." Tess follows in the footsteps of Kepler, a groundbreaking space telescope launched in 2009. It also used the "transit technique" to confirm more than 2,000 so-called exoplanets. But Kepler, for its primary mission at least, only looked at a very small patch of sky, and many of its discoveries were simply too far away or too dim for other telescopes to pursue with further analysis.
The launch of TESS was scheduled to Monday evening, but it has been postponed until Wednesday. SpaceX tweeted Monday afternoon that it is "standing down today to conduct additional GNC [guidance navigation control] analysis, and teams are now working towards a targeted launch of @NASA_TESS on Wednesday, April 18."