In 2006, Pluto was famously demoted from a planet to a dwarf planet. It remains the most famous dwarf planet today, but there are others in our solar system, including potentially hundreds that ...

The reclassification of Pluto as a dwarf planet continues to stir up a hornet's nest of controversy and debate, as Space.com meets one astronomer who believes the decision to have been a mistake.

An international team of astronomers have discovered a new dwarf planet orbiting in the disk of small icy worlds beyond Neptune. The new object is roughly 700 kilometers in size and has one of the ...

New observations reveal that the far-flung object 2014 UZ224 (informally known as DeeDee, for "Distant Dwarf") is about 395 miles (635 kilometers) wide — big enough to claim "dwarf planet" status.

Our solar system is much like a trail of microcosmic breadcrumbs: Follow the molecular bits as far back as they go, and you'll learn a thing or two about where many of our planets and other celestial ...

The five dwarf planets recognized by the International Astronomical Union are Pluto, Ceres, Eris, Haumea and Makemake—and these are pictured with 2017 OF201 in a telescope image. Dwarf planets: NASA / ...

Ten observatories in six European countries teamed up for recent observations of a stellar occultation by the dwarf planet Haumea, which surprisingly show a narrow and dense ring orbiting the dwarf ...

A rare type of plutonium has been found in the crust below the deep sea, offering new clues as to how heavy metals form in star explosions and mergers. Strange hexagonal diamonds may have been ...

In a new study, astronomers detail observations of what could be the first known exosatellite - a natural object orbiting a ...

Among the roughly 10 billion white dwarf stars in the Milky Way galaxy, a greater number than previously expected could provide a stellar environment hospitable to life-supporting exoplanets, ...

Do aliens sleep? You may take sleep for granted, but research suggests many planets that could evolve life don’t have a day and night cycle. It’s hard to imagine, but there are organisms living in ...