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

Space scientists look back on 30 years of exoplanet discoveries — from rows of massive ‘super-Earths‘ to worlds with ...

Astronomers have discovered fresh evidence suggesting the possible existence of an unseen planet in the far reaches of our ...

Just two decades after astronomers discovered the first exoplanet, NASA has confirmed the existence of 6,000 alien worlds.

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...

Astronomers are buzzing over 3I/ATLAS, a mysterious object hurtling through our solar system, and a new theory claims it can ...

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 ...

Astronomers have observed a massive growth rate in a free-floating rogue planet that’s gobbling up gas and dust at a record ...

For all the talk about life across the cosmos, Earth remains the only confirmed example. That single data point makes your ...