The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

While space harbors plenty of mysteries, it turns out that Uranus' smell isn't one of them. Here's the explanation for why it's so uniquely stinky.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

On Feb. 11, the sun will meet with disruptive Uranus, triggering unexpected shake-ups and upheaval that no one saw coming.

By the time March gets underway, Mercury, Saturn and Neptune will have drifted too close to the sun to be readily visible with Venus not far behind, leaving Jupiter, Mars and Uranus to populate ...

Ahead of its dance with Saturn on Feb. 24, Mercury should be seen on Feb. 19 at magnitude -1.2 with binoculars 20 minutes ...

By the time March gets underway, Mercury, Saturn and Neptune will have drifted too close to the sun to be readily visible with Venus not far behind, leaving Jupiter, Mars and Uranus to populate ...