The origin of super-Earths and sub-Neptunes has been revealed in a system of four young planets that are dramatically losing ...

The space rock is hurtling through our cosmic backyard at a zippy 26,200 miles per hour, according to the space agency.

Astronomers have long searched for life within a rather narrow ring around a star, the "habitable zone," where a planet ...

Despite its small size, Mars seems to have a huge impact on the orbital cycles that govern Earth’s climate, especially those ...

For over a century, scientists have suspected there could be a hidden planet lurking far beyond Neptune—massive enough to ...

When astronomers announced Kepler-452b, they were not just adding another distant world to a growing catalog. They were ...

Astronomers watched a distant star dim for months and found a metal-rich cloud that may be the aftermath of a massive ...

The object dubbed Earth's "second moon" is actually a quasi-satellite that's accompanied the planet since 1957 — not a true ...

That would make it thousands of times more massive than any moon orbiting a solar system plane  — so massive it could make ...

L ast February, debris from a SpaceX Falcon 9 rocket set the skies of Europe ablaze before crashing down to Earth in Poland, ...

New research suggests that essential components of life may assemble in interstellar space long before planets or oceans ...