A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining ...

While Planet Y has been not yet been directly observed, unexpected inclinations found in the orbits of roughly 50 distant ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. Are planets in the solar system that are closer ...

We all need some space sometimes—but it's harder to find than you might think. How far into our universe do we have to go to ...

The moon and Venus will shine vividly alongside a bright star in the early morning in a celestial rendezvous that should be ...

In the hunt for extraterrestrial life, we usually look for planets orbiting sun-like stars and icy moons. But there is ...

Discover the concept of terraforming through science fiction and scientific origins, focusing on the potential habitability ...

The next full moon is a special supermoon. The first of three to occur this year. When to watch and what to know.

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 ...