Large hailstones made of ammonia may explain why the gas is missing from large pockets of Jupiter's atmosphere.

Astronomers have discovered that super-Earth exoplanets are more common across the universe than previously thought. While it can be relatively easy to locate worlds that orbit close to their star, ...

Recent flybys of the fiery world refute a leading theory of its inner structure — and reveal how little is understood about ...

A new study released on Thursday describes a search for what are called "microlensing" events, where a planet acts as a ...

Study suggests Earth-like exoplanets may be common, based on microlensing data revealing super-Earths with distant orbits.

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

Astronomers detected potential biosignatures on exoplanet K2-18b, but findings remain inconclusive. Claims of alien life ...

From spellbinding images to groundbreaking scientific discoveries, we look back on some of Hubble's most exciting milestones.

An international team of astrologers claim to have discovered a 'super Earth' that's bigger than our own blue planet but smeller than Neptune.

Robert Lee Hotz covered new research and its impact on society for The Wall Street Journal.

Scientists are investigating the number of super-Earths compared to Neptune-sized planets in other solar systems. Their research suggests that super-Earths are at least as common as Neptune-sized ...