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

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 ...

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

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

The Copernican Principle, named in honor of Nicolaus Copernicus (who proposed the heliocentric model of the universe), states ...

It takes a certain kind of brave (and perhaps foolish) person to join Starfleet and venture into the great unknown, and most of the stories in the Star Trek universe are about an adventure gone wrong.

The known universe is full of shockingly huge things. Here are the largest planets, stars, galaxies, and structures we've observed in the universe so far.

ESO's Very Large Telescope has observed a rogue planet and revealed that it is eating up gas and dust from its surroundings ...

A star about 600 light-years away is giving astronomers a front-row view to the environments in which rocky planets like Earth form around the most abundant stars in the universe. Called ISO-ChaI 147, ...

Brown dwarfs, between about 13-80 Jupiter masses, will fuse deuterium+deuterium into helium-3 or tritium, remaining at the same approximate size as Jupiter but achieving much greater masses. If a star ...