On April 2, for the fifth time in less than three years, the International Space Station fired its engines to dodge a piece of orbital debris that appeared on a collision path. Other spacecraft also regularly scoot out of the way of rocket and satellite debris. Such evasive action will be needed increasingly frequently, a new study finds.

Astronomers have found elements in the dead stars’ atmospheres that suggest rocky planetary bodies once orbited the stars.

A huge shattered moon could have sprayed ice particles around the newborn planet.

Odd spots on the lunar farside could be ancient material that originated deep inside the moon.