Pluto reaches opposition and is ready for those who want to chase it down. Use the biggest scope you've got, or take aim with ...

We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between five and 18, plus hundreds of potentially undiscovered ones, depending on ...

Experimental Propulsion Tech Could Reach Mysterious Planet Beyond Pluto in 10 Years Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid ...

The James Webb Space Telescope (JWST), operated by NASA, has uncovered intriguing new details about Charon—Pluto’s largest moon—including the presence of previously undetected surface chemicals. This ...

8 night sky events to see in July, from a ‘buck moon‘ to a rare view of Pluto Get your binoculars ready for dark skies, elusive planets, and a sky show spanning the entire month.

From that day forward, astronomers have officially classified Pluto as a “dwarf planet,” one of several orbiting our Sun. To this day, some who grew up believing that Pluto was a full-fledged ...

New data captured by the James Webb Space Telescope has finally given astronomers new clues about how Pluto cools itself.

If confirmed, the newfound dwarf planet would be what Cheng calls an “extreme cousin” of Pluto. The findings were published on the preprint website arXiv and have not yet been peer-reviewed.

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system.

Although it is substantially smaller than Pluto, which is 1,477 miles (2,377 km) across, 2017 OF 201 is nevertheless large enough to be classified as a dwarf planet. Problems for Planet Nine ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.