There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

What's special about Chiron's rings is that they're still forming; this marks the first time astronomers have ever seen a ...

This article was originally featured on The Conversation. Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of ...

If you look up on a clear night, the brightest and largest object in the sky will probably be the moon. And unless you have a decent telescope, it is the only natural satellite you can see with your ...

Researchers are studying eccentric warm Jupiters, giant exoplanets that follow odd, elongated orbits unlike anything in our solar system.

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and Earth. The authors dubbed it Planet Y.

Planets do not emit visible light like stars; they shine in the sky because they reflect sunlight. Exoplanets too reflect ...

Diamond rain falls on ice giants Uranus and Neptune, where intense pressure and heat transform methane into crystallizing ...

The interstellar object 3I/ATLAS has gathered significant scientific attention, and soon it will reach its closest point to ...

One of the most notable properties of the giant planets in our solar system—Jupiter, Saturn, Uranus and Neptune—are the ...

Space scientists look back on three decades of exoplanet discoveries—from rows of massive ‘super-Earths‘ to worlds with ...