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 ...

The mysterious Kepler-1625b-i and its parent planet may once have been siblings. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The first ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's illustration of a hot, Neptune-size alien planet. Warm Neptune-size exoplanets are not nearly as common as ...

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, ...

A team working with data from the dearly departed Kepler space telescope has reported a possible moon orbiting an exoplanet some 5,000 light years away. It falls somewhere between the size of Earth ...

Scientists have identified a new kind of planet- an ‘ultrahot Neptune’, or a giant exoplanet that orbits its star 23 times closer than Mercury orbits our sun. Current estimates say that around 1 in ...