The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...

Planet Y is the latest in a series of hypothetical solar system planets that scientists have proposed in recent years, all with slightly different characteristics, but collectively believed to be ...

Why do all planets in our solar system orbit the Sun the same way? This documentary unravels the cosmic forces, from the ...

A distant gas giant the size of 10 Jupiters is now the first planet outside Earth's solar system to be mapped in three ...

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

When you see art of our solar system as the planet orbit the sun, you may notice that Earth's orbit has a tilt. It is not a perfect circle. What's more, Earth is not the only planet that displays such ...

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 reach somewhere truly empty? Our first stop is the International Space ...

Voyager 1, launched in 1977, has traveled farther than any spacecraft in human history. After more than four decades of silent endurance through space, it now sails beyond the orbit of the outer ...

The European Space Agency's ExoMars Trace Gas Orbiter image of interstellar comet 3I/ATLAS as it passed close to Mars. (The European Space Agency) A mysterious interstellar comet — just the third such ...

The James Webb Space Telescope measured a potential moon-forming disk encircling an exoplanet, NASA recently announced, inviting researchers to observe and study moon formation as it happens, while ...