4 Billion Years Ago a Giant Impact Reshaped Jupiter's Largest Moon. Story by Mike McRae • 6mo. G anymede is a moon that wears its scars with the resignation of an old veteran.

Baby Jupiter was smacked by a planet 4.5 billion years ago. By Mike Wehner. ... The planet that may have struck Jupiter would have to have been huge, according to the simulations.

But new research has found that the solar system's largest moon felt the force of an even bigger asteroid - over 4 billion years ago. ... which blasted off last year, reaches Jupiter in 2031.

New simulations show that Jupiter's massive moon Ganymede was knocked off its axis when it was struck by a roughly 90-mile-wide asteroid around 4 billion years ago. The colossal collision was ...

The solar system's most volcanic body, the Jupiter moon Io, has been in turmoil for at least 4.57 billion years, right back to its birth and the infancy of the sun.

Theorbits of Jupiter, Saturn, Uranus and Neptune may have been altered by the fly-by of an enormous object from deep space, billions of years ago.

This intense squeezing and stretching would be enough to melt parts of the lunar rock, says Nimmo, and this likely occurred around 4.35 billion years ago, which corresponds to the age of most ...