Even though humans have pondered the moon since the first of us looked skyward, there is still much we don't know about it.

New research suggests that what were once thought to be traces of the Moon's formation are remnants from a transformative "re-melting" event ... after the rest of the solar system.

Additionally, computer models of planetary formation indicate that a collision massive enough to create the Moon likely occurred much earlier, within 100 million years of the Solar System’s ...

Scientists believe the moon formed during a giant impact about 60-175 million years after the solar system was born. To arrive at this estimate, they can use rocks from Earth. As large planetesimals ...

Loki Patera is 202 kilometres (126 mi) in diameter, covers 20,000 sq km (7,700 sq mi), and was the largest volcanic feature found on Io until these new observations revealed the hot spot in the south ...