Those of us born in the latter part of the last century grew up learning that there are nine planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto, in increasing distance from the Sun – and we had clever mnemonics to help.īut in 2006, the International Astronomical Union, the entity charged with (among other things) deciding what to call stuff in space, held a vote that overnight reduced the number of planets in the Solar System from nine to eight.įrom its discovery in 1930 until the 1990s, Pluto was the largest known object in a distant region of the Solar System that came to be called the Kuiper Belt. But this isn’t a view that’s universally held. Is Die Hard a Christmas movie? (Yes.) Does pineapple belong on pizza? (Also yes.) Is Pluto a planet? ![]() ![]() There are some topics that elicit strong opinions from people.
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