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

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

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

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as ...

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

Observations of exoplanets typically provide astronomers little more than an orbit, a mass and a radius. If the radius and ...

A Soviet-era spacecraft meant to land on Venus in the 1970s is expected to soon plunge uncontrolled back to Earth.

But no matter, the country he now rules (more or less) is still spending $75 billion annually and, as of now, planning to spend $1.7 trillion over the next 30 years to update or—the term of the ...