Though astronomers have known about the threat posed by near-Earth objects since the 1970s, efforts to catalogue potentially ...

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

SpaceX CEO Elon Musk shares his vision for life on Mars in an exclusive interview on 'Jesse Watters Primetime.' ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

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

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

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

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

A rare and dramatic scene unfolds 140 light-years from Earth. A rocky planet, once whole, is now crumbling to dust under the ...

Championing sustainability by promoting nature nonprofits, increasing recyclability and reducing waste and emissions.