It's not exactly close — 25 trillion miles from Earth, say the scientists who spotted it. But that might be near enough for further exploration. It's about Earth's size, with mild temperatures.
Scientists say each of these planets has one searingly hot side that's always facing the star and one frigidly cold side that's always facing away. But the regions in between might be cozy.
Something very big, out beyond Neptune, is warping the orbits of small, icy objects circling our sun. Astronomers haven't seen it yet, but say the culprit could be a planet with 10 times Earth's mass.
Planet Nine, as scientists are calling it, deserves a better name if it becomes reality. Should it be Plutoo? Or Plutwo? Yeah, we know you can do better, so come brainstorm with us.
Astronomers using telescopes in Hawaii and California have found two exoplanets orbiting a star a mere 54 light-years away. The discovery is important for two big reasons.