The smashups are thought to have occurred at least 100 million years ago, but the moons they created are new to astronomers.

Illustrations by the 17th-century astronomer Cassini (a-c), compared with Jupiter's current Great Red Spot as captured by Eric Sussenbach in 2023. Disclaimer: AAAS and EurekAlert! are not ...

Europa, one of Jupiter’s intriguing moons, is hiding an ocean beneath its icy shell — an ocean that might harbor alien life.