Researchers estimate more than a trillion planets could exist in the elliptical galaxy at the center of this image. University of Oklahoma Scientists have confirmed the existence of over 3,600 ...

Because the planets represent the vast majority of planets that are thought to populate the galaxy, the team said, the system also can help astronomers better understand planet formation in general.

X-rays may have revealed the first planet outside our galaxy Process may point to a general means of finding very distant planets.

Typically, such planets are hard to find, given their small size and distance from their stars, but thanks to new research techniques, scientists now think there could be as many as six billion ...

“There’s at least 100 billion planets in the galaxy — just our galaxy,” says John Johnson, assistant professor of planetary astronomy at Caltech and coauthor of the study, which was ...

If this planet really exists, M51-ULS-1 would mark the first pinpointed star system in another galaxy that has an “extroplanet,” or a planet found outside of our home galaxy, the Milky Way.

Scientists have used X-rays to spot what might be the first planet detected beyond the Milky Way galaxy.

The ingredients for planet formation have turned up in part of a nearby galaxy where it was thought planets might not emerge. The discovery, reported on 24 April in Nature Astronomy 1 and made ...

Rogue planets are homeless worlds. They have neither sunrises nor sunsets, because unlike the planets we’re more familiar with, these lonely worlds aren’t tethered to a star. Instead, they ...

Crunching the numbers, a conservative estimate says there should be at least fifty billion planets in the entire galaxy, and about 500 million of those should be inside the habitable zone.

The Agency’s team of planet-hunters announced yesterday the discovery of 11 new planetary systems, which together harbor 26 brand spanking new planets.

NASA's Spitzer Space Telescope has teamed up with a telescope on the ground to find a remote gas planet about 13,000 light-years away, making it one of the most distant planets known.