When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Editor's Note: This is the full text of a proposal for the definition of a planet released today ...
If you want to start an argument among astronomers, ask them if Pluto is a planet. In 2006 the International Astronomical Union (IAU) defined a planet as an object which 1) orbits the Sun, 2) is ...
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