For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s ...

For decades, astronomers have known something didn’t add up in our universe. The amount of “normal” matter—stars, gas, and ...

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our ...

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

The northern lights revealed themselves to a handful of states Wednesday, but if you missed out, you still have a chance to ...

Two astrophotographers captured breathtaking video of over 105 red sprites over Tibet during a massive thunderstorm.

NASA astronaut Don Pettit captured breathtaking video of a rare atmospheric phenomenon from his perch high above Earth on the ...