The Kepler mission scopes out stars and galaxies thousands of light-years away to find exoplanets. NASA's upcoming planet hunter, however, will keep an eye on solar systems closer to home. The Transiting Exoplanet Survey Satellite or TESS will find planets by observing stars and looking out for shadows cast by transiting planets. It will be programmed to compute for a planet's size and the time it takes to orbit its star, because those are the information astronomers need to determine if it's habitable. Since Earth- and even super-Earth-sized planets are tiny, though, TESS will observe small bright dwarf stars only hundreds of light-years away.