Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be ...

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

The ongoing search for an additional planet at the solar system's edge has identified a new candidate, potentially ...

Yes, give us human beings credit. In our relatively brief history, it’s no small thing to have come up with two different ways of thoroughly devastating ...

Catch some morning meteors, see the Moon reach First Quarter, and watch Mars visit the Beehive in the sky this week.

Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

Jupiter and Mars shine in the evening, more planets gather in the morning, and the Eta Aquariid meteors join in.

The full panel of judges on the 4th U.S. Circuit Court of Appeals voted 9-6 to keep the ruling from U.S. District Judge Ellen ...