NASA 'Code-Red' Priority --"Kepler Mission Zeros in on TRAPPIST-1 Earth-Sized Worlds" (VIDEO)

On Feb. 22, astronomers announced that the ultra-cool dwarf star, TRAPPIST-1, hosts a total of seven Earth-size planets that are likely rocky, a discovery made by NASA's Spitzer Space Telescope in combination with ground-based telescopes. NASA's planet-hunting Kepler space telescope...