Have you ever wondered why comets look the way they do when they get close to the sun?
There are a million space rocks nearby. Astronomers have only mapped about 9,700 of them.
When it comes to saving the Earth from threatening astroids, Bruce Willis can only do so much.
In order to reach Mars, our astronauts may have to stop by a lassoed astroid first.
While there's still no evidence that life evolved on Mars, we now know that it at least could have.
Astronomers have found a new and more accurate way to measure the ages of huge groups of stars called globular clusters.
If the earth keeps accumulating mass, does that mean that the Earth's gravitational pull has been increasing?
Scientists have a new estimate for the geological age of one of Mercury's oldest regions.
One of the great mysteries: Does life exist elsewhere in the universe. Research has found that such planets may be more common, and much closer, than we think.
NASA's Curiosity rover has found evidence for life-supporting conditions on ancient Mars.