Astronomers using the Spitzer Space Telescope have discovered what they believe is a planet two-thirds the size of Earth. This artist’s concept shows what astronomers believe is an alien world just two-thirds the size of Earth (NASA / JPL-Caltech) Located only 33 light years away, the exoplanet candidate UCF 1.01 is close to its star, so close it goes around the star in 1.4 days. The planet’s surface likely reaches temperatures of more...
