We understand planets better than ever, and that’s why Pluto still isn’t one

Although we now believe we understand how the Sun and our solar system formed, this early view is an illustration only. When it comes to what we see today, all we have left are the survivors. What was around in the early stages was far more plentiful than what survives today, a fact that is likely true for every solar system and failed star system in the Universe. (Credit: JHUAPL/SwRI)

In 2006, Pluto was demoted in a very controversial decision. Unless you ignore nearly all of planetary science, it’ll never be one again.

Ethan Siegel

From 1929 until 2006, Pluto lived in the imagination of children and adults alike as the ninth and…

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