An international team of astronomers reports the detection of two new brown dwarfs orbiting distant stars using NASA's ...

The findings have revealed a lot about Ceres' origin. The dwarf planet stands out from all the others in the asteroid belt.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

wide dwarf planet may have originated at the outer edge of the solar system and may have migrated inwards to its current home ...

Saturn was already the reigning champion in the moon department. Now, with 274, Saturn has more moons than all the other ...

But Charon was half the size of Pluto itself, so big that the Pluto-Charon combination ... adopted a resolution to reclassify Pluto as a dwarf planet. The reasoning was that it didn't satisfy ...

A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

About 650 light-years from here, in the constellation Aquarius, lies the planetary nebula Caldwell 63, commonly known as the ...

Together, dwarf planets can help scientists learn a lot ... 2015 RR245 is catalogued as the "18th largest" object in the Kuiper belt, according to the Minor Planet Center, the organization ...

New data from NASA's Chandra X-ray Observatory telescope and the European Space Agency's XMM-Newton satellite has shown that a planet may have been destroyed by a white dwarf—one of the dimmest ...

For more information on the biggest astronomical events of 2025, check out our celestial calendar. Pluto was reclassified from a planet to a dwarf planet by the International Astronomical Union ...