Young, close-orbiting exoplanets known as sub-Neptunes may form farther from their stars and migrate inward or lose their ...

The eight planets in our solar system orbit the sun in roughly the same plane because they all originally formed from the same disc of debris around the sun. The line the sun traces across the ...

Saturn now leads the solar system with 274 known moons. Scientists say many moons formed from past collisions.

Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

The planets in our solar system orbit the sun essentially along the same line across the sky in a plane called the ecliptic. For that reason, planets in our Earthly sky always appear somewhere ...

GJ 1214 b, nicknamed Enaiposha, is a planet discovered 47 light-years away that has been reclassified from a mini-Neptune to ...

A combination of cosmic processes shapes the formation of one of the most common types of planets outside of our solar system ...

Uranus' accidental discovery 240 years ago greatly enhanced our understanding of the solar system, doubling the size of the ...

A combination of cosmic processes shapes the formation of one of the most common types of planets outside of our solar system, according to a new study.

The James Webb Space Telescope has captured its first direct images of carbon dioxide in a planet outside the solar system in HR 8799, a multiplanet system 130 light-years away that has long been a ...