Though they don't orbit around our sun, sub-Neptunes are the most common type of exoplanet, or planet outside our solar ...

A team of astronomers believes they may have spotted a serious candidate for a ninth planet in our Solar System. This object, ...

The idea that our Solar System is representative of other solar systems hasn't survived the age of exoplanet discovery.

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

Astronomers using NASA’s James Webb Space Telescope have taken a major step toward understanding a puzzling type of planet ...

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

These types of exoplanets are some of the most common in our galaxy - but they've remained mysterious until now.

For years, astronomers have been searching for a ninth planet in our solar system (after giving Pluto the old heave-ho and demoting it to a dwarf planet) and now researchers say they’ve found a ...

Astronomer Eliza Kempton said that she had waited her "entire career" to peer into an atmosphere from this mysterious class of planets.