A Very Short Fact: On this day in 1930, the dwarf planet Pluto is officially named.
âThe first TNO to be discovered was Pluto, in 1930. Even after Pluto's small size became apparent (and subsequently, thanks to the discovery of its largest satellite in 1978, its small mass), people tended to think of Pluto as the ninth planet. However, when the known population of the Kuiper belt blossomed into hundreds of objects, several of which rivalled Pluto in size, it became increasingly anomalous to classify Pluto as a planet and yet other Kuiper belt objects as something different. When Eris was confirmed to be more massive and probably larger than Pluto, then logically either all the large TNOs had to be called planets, or none of them. However, many people argued to retain Pluto as a planet on sentimental or historical grounds. â From Planets: A Very Short Introduction by David A. Rothery.
[Pg 16 - Planets: A Very Short Introduction by David A. Rothery.]
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