NASA

A giant asteroid's impact is considered the likely cause of the mass extinction of the dinosaurs almost 66 million years ago. While there is no...

On Earth, many forces have combined to keep the conditions remarkably stable for millions of years. But other planets may not be so lucky....

It is one of the fastest objects of its kind ever seen.

This group of polar bears has been isolated for several hundred years from their Arctic counterparts.

How do you choose a rock on Mars? Sometimes you don’t— it chooses you.

Colossal collisions are linked to solar system science.

The telescope is still performing well.

Hi-diddly-ho, neighborino!

Huge rings around a black hole.

It is roughly 50,000 light-years across and billions of years old.

Get outside before sunrise on May 29 and see them.

The twosome – collectively known as Arp 94