A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

Jeremy Irons, Vanessa Redgrave and Michael York have joined the voice cast of 3D animated family sci-fi adventure “The ...

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

Mars, one of our closest planetary neighbors, has fascinated people for hundreds of years, partly because it is so similar to ...

Explore how Earth Day 2025 spotlighted the urgent shift from fossil fuels to renewables, and why accelerating clean energy is ...

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.

It’s a shocking twist: The new Planet Hollywood has really good food. The celeb-magnet eatery opened its third NYC iteration ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...