At a frigid -125 degrees Fahrenheit (-87 degrees Celsius), WD 1856+534 b is the coldest planet ever directly observed, ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in our solar system. However, as with all ninth planet research, the new ...

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

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

A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But ...

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

From outer space threats to dangerous dino drama — from super-powered action to robotic horror — and from mega-budget ...

They reveal a whole new level of detail in these planet-forming systems. Breakthroughs, discoveries, and DIY tips sent every ...

A giant object that has been lurking in the relative galactic vicinity of the Solar System this entire time has just been ...

The Solar System consists of our star, the Sun, and everything bound to it by gravity; the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, along with dwarf planets like ...