Every planet in our solar system is essentially round. But out in the universe, are there any planets that aren't spherical? Technically, planets are round, by definition; they need to have enough ...

The universe is full of wonders, but some worlds are downright deadly. From searing heat to violent storms, these planets make Earth look like a paradise. Many of them challenge everything we know ...

We currently know of more than 5,800 planets beyond the solar system, but we've only found the tiniest fraction of the exoplanets that astronomers think lie elsewhere in the universe.

But it’s not just looks. Rocky composition, general size, orbital behaviors—a lot of those qualities can be the same on both ...

Fresh results from near-infrared instruments foretell a bright future for finding life elsewhere in the Milky Way ...

Dark matter is one of the biggest puzzles in science. Although it makes up about 85 percent of all matter in the universe, it ...

Billions of galaxies are in the universe, with billions of stars in every galaxy. Could billions of planets be out there too?

Space What we know about the innumerable planets outside of our solar system And why scientists now think that every star has at least one planet.

The James Webb Space Telescope has detected a possible gas giant the size of Saturn in the stellar system nearest our own ...

This planet only exists in a parallel universe that appeared for an episode on an episode of Star Trek: The Animated Series and it's one of the strangest along with being the most dangerous. Its ...