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How the James Webb Space Telescope is helping size up tiny dwarf planetsThe relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.
Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...
Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...
In 2006, the International Astronomical Union (IAU) decided that a large celestial object is a planet only if its gravitational orbit around the sun makes it round and if it’s big enough to ...
What do Uranus, Pluto, and an awe-inspiring celestial event have in common? They all converge on the iconic date of March 13.
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