A distant world about 40 times more massive than Earth may be the remnant core of a giant planet, or a giant planet in the making whose growth stalled, a new study reports.
An alien planet that orbits a star other than our sun is referred to as an "exoplanet." Learn more about the types of alien planets, including exoplanets and extrasolar planets, and get the latest news.
For the first time ever, astronomers have measured wind speed on a brown dwarf, an object heftier than a planet but not massive enough to host the fusion reactions that power stars.
An exoplanet may be shaped like an American football due to the mighty gravitational forces it experiences close to its star, a new study finds.
Planets like Saturn's moon Titan, one of the most potentially habitable places in the solar system, could reveal their secrets to future telescopes.
Double sunsets may be just as common in our galaxy as the solitary kind that we know on Earth, and this has big implications for our search for life outside the solar system.
Astronomers have spotted the exotic signature of iron rain in the atmosphere of the huge, scorching-hot exoplanet WASP-76 b.
Three teams of astronomers have been fascinated by an alien world known as K2-18b. But what's all the fuss about?
Looking for life traditionally starts with finding a planet with the right temperature — but scientists are working to find new criteria for tracking down potentially habitable worlds.
NASA faces a difficult choice: What does the agency want to select as its next big space telescope, the instrument that will shape scientists' research in the 2040s?
All four outer planets in our solar system sport at least a few rings, but so far, we haven't observed any such features around exoplanets. That's confusing.
A newly found planet orbits so close to its parent star that it's close to being torn apart by the tidal forces induced by gravity.
Say what you will about winter's chill and summer's burn — Earth's climate is pretty great for life as we know it.
In studying what's known as "flammable ice," researchers have discovered that microscopic bubbles within the strange material contain life.
Photographing an alien world is incredibly difficult. Now try doing it from a massive balloon high in Earth's atmosphere.
One of NASA's great telescopes will go offline today (Jan. 30) after 16.5 years of observations that helped to paint a more complete picture of the universe.
The hottest exoplanet ever found is so infernally hot that it's ripping apart hydrogen molecules in its atmosphere, astronomers have found.