What if the aliens are hiding from us? Hiding a whole planet is easier than you think.
It may sound far-fetched, but humanity faces a major potential danger: someday, there might be a gigantic explosion on the sun.
Pluto is too small to be considered a planet anymore, but our solar system appears to have a new ninth planet.
NASA wants YOU to help them make new discoveries! Crowdsourcing alleviates big data problems for astronomers.
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.