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  • 7/11/2025
What’s the real reason Pluto WAS a planet and isn’t anymore?

My take: It never should have been. But I still love it! Hear me out! Once upon a time in 1930, there were 8 planets. Then an observatory in Arizona spotted a new one...

If you look at the reports at the time, you’ll see we thought it was the size of Earth or larger! But then… with more observation, estimates started to shrink…

By the time I was a kid, we knew Pluto was smaller than the MOON! And finally, we discovered something else...

So in the end, the International Astronomical Union officially revoked its planet status and said all planets now have to meet 3 criteria.

But Pluto doesn’t need to be a planet for me to love it!

For more optimistic science and tech stories, subscribe.

#animation #pluto #science #technology #historyfacts

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Learning
Transcript
00:00What's the real reason that Pluto was a planet but isn't anymore?
00:04My hot take is that it never should have been, but I still love it.
00:07Hear me out.
00:07So once upon a time in 1930, there were eight planets.
00:10And then an observatory in Arizona spotted a new one.
00:13If you look back at the original reports, you'll see we thought it was the size of Earth or larger.
00:18So this was huge, but then over time estimates started to shrink and shrink and shrink.
00:23So by the time I was a kid, we knew that Pluto was smaller than the moon.
00:27And it was the ugly duckling of the planets because it also had this weird orbit.
00:30But it wasn't an asteroid, and it wasn't a moon, so...
00:34But then in 2005, we discovered these.
00:36Pluto's not alone.
00:38So finally, the International Astronomical Union officially revokes Pluto's planet status
00:43and said that all planets have to meet these three criteria.
00:46And the world lost their mind.
00:47I remember being devastated.
00:49But Pluto doesn't have to be a planet to be loved.
00:52If you learned something, subscribe.

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