SpaceX is about to leave a permanent mark in space. Astronomers said this week that a piece of a Falcon 9 rocket that was launched in February 2015 is currently on a trajectory to collide with the ...

The moon did indeed coalesce out of tiny bits of pulverized planet blasted into space by a catastrophic collision 4.5 billion years ago, two new studies suggest. The new research potentially plugs ...

Astrobotic will let its lander burn up in the Earth's atmosphere when it comes back to our planet. The spacecraft's mission to the moon was scuppered shortly after launch due to a fuel leak.