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

The chance of a newly discovered space rock hitting Earth in about eight years was predicted at 1.6 percent last week. Though ...

You'll be able to easily see four planets in the February evening sky, and with any luck you'll be able to raise that number to five during the final week of the month. You'll be able to easily ...

Yes, six planets will be visible in the January night sky. And yes, they'll be in a line. But because planets always appear in a line from our Earth-bound vantage, the alignment isn't anything out ...

So any atmosphere the planet may have had easily escaped into space long ago and left behind an airless, sizzling ball of ...