Giant planets are not rare per se — after all, we have four in our own solar system. Such large worlds are, however, rarely ...

Plus, an in-depth look at how the West Texas city of Seminole reacted when a measles outbreak tore through the region.

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the ...

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"Social media was flooded with memes and witty comments, some of which also highlighted that Pluto’s designation as a "dwarf planet" does not negate its planetary essence. One user insightfully ...

Kirk to bend Trump’s ear toward Pluto. Getty Images The now-dwarf planet was first discovered in 1930 by Clyde W. Tombaugh, an Illinois native, at Lowell Observatory in Flagstaff, Arizona.

The International Astronomical Union, which reclassified Pluto as a dwarf planet in 2006, is the arbiter of such classifications. Andrea has written about NASA and the commercial space sector ...

TOKYO, May 16 (Reuters) - Japan is ready to support the United States' lower-cost lunar missions, its space agency chief said on Friday, after the U.S. administration proposed a $6 billion cut to ...

WASHINGTON, May 15 (Reuters) - NASA's Perseverance rover has observed an aurora on Mars in visible light for the first time, with the sky glowing softly in green in the first viewing of an aurora ...

Farther out, its debris disk is similar to our solar system's Kuiper Belt, where dwarf planets, comets, and other bits of ice and rock are found (and sometimes collide with one another).