New models suggest Uranus and Neptune may hold far more rock than expected, raising questions about how these distant planets formed.

Astronomers have unexpectedly discovered the heaviest Neptune-like planet yet — one more than four times the mass of our solar system's Neptune — yet it remains a mystery how the world might have ...

Warm Neptune-size exoplanets are not nearly as common as super-Earths or hot Jupiters — and we are now closer to finding out why. Our galaxy apparently has a dearth of Neptune-size worlds that orbit ...

Astronomers may, for the first time, be confirming an exomoon in our universe, much like our moon, but outside our solar ...

In the spring of 2009, the Kepler Mission commenced high-precision photometry on nearly 156,000 stars to determine the frequency and characteristics of small exoplanets, conduct a guest observer ...

NASA's Kepler and Hubble space telescopes have spotted evidence of a Neptune-size satellite orbiting the Jupiter-like planet Kepler-1625b, which lies about 8,000 light-years from Earth, a new study ...

Researchers have discovered a new planet the size of Neptune, approximately 32 light-years away from Earth. A new study, published in the scientific journal Nature, details the discovery of AU Mic b, ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A Neptune-size planet beyond the solar system has telltale traces of water vapor in its ...

Assuming you’ve accepted Pluto’s demotion, Uranus and Neptune are the two planets in our Solar System farthest from Earth. That distance means humanity is still learning a lot about them. Some of ...

Scientists have discovered a giant new storm on Neptune that’s about the size of our planet. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content. The ...

Astronomers have discovered clear skies and steamy water vapor on a planet outside our Solar System. The planet, known as HAT-P-11b, is about the size of Neptune, making it the smallest exoplanet ever ...

A Neptune-size planet beyond the solar system has telltale traces of water vapor in its atmosphere, making it the smallest exoplanet known to have the wet stuff yet, scientists say. Several massive ...