Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...
The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.
The head of NASA says maybe Pluto is a planet after all. He is wrong because Pluto is part of the rest of the solar system ...
The NASA administrator’s latest remarks in support of reexamining Pluto’s status come 20 years after the orb was downgraded to a dwarf planet by the International Astronomical Union ...
A bizarre planetary pairing 190 light-years away is challenging everything astronomers thought they knew about how worlds ...
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