Beyond our solar system, countless alien worlds of lava, ice, water and noxious gas swirl through the cosmos. Here are some ...

But that doesn't necessarily mean planets are perfect spheres. "We call them round, but they're not really perfectly round, ...

Astronomers have discovered an exoplanet about half the size of Venus orbiting Barnard’s star, the closest single star to our ...

Telescope observations show that frequent radiation from the exoplanet's star, a 7 billion-year-old red dwarf about the size ...

Our planet's habitable conditions are in large part due to the type of star the sun is and its relative age. There are, of course, a number of stars in the cosmos, each with different characteristics ...

In 1992 astronomers reported the first planet-size masses around a dead star, the pulsar PSR1257+12, which sits 2,000 light-years away. Three years later came news of the first known exoplanet ...

New research on WASP-107b reveals how strange this planet's atmosphere is, experiencing perpetual night on one side ...

Newly discovered by astronomers publishing for the journal Astronomy and Astrophysics, Barnard b orbits the closest solo star ...

The existence of a moon located outside our solar system has never been confirmed but a new NASA-led study may provide ...

A sodium cloud detected in the vicinity of an exoplanet named WASP-49 b hints at the presence of a natural satellite, also ...

Using the James Webb Space Telescope, astronomers have found a "first of its kind" world, an exoplanet that is twice the size ...

Was one—or all—of these bright naked-eye planets the source of the famous “star of Bethlehem” story in Christian tradition? It seems likely, but regardless, this week is a great time to ...