Alan Stern said this quote

“ Of course Pluto is a planet: It's massive enough to have its shape controlled by gravity rather than material strength, which is the hallmark of planethood. ”

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We're in the space exploration business, and the outer solar system is a wild, wooly place. We haven't explored it very well.

~ Alan Stern

Alan Stern Space Solar Place

Pluto is still active four and a half billion years into its history. It was expected that small planets like Pluto would cool off long ago and not still be showing geological activity. Pluto is, in fact, showing numerous examples of geological activity on a massive scale across the planet.

~ Alan Stern

Alan Stern History Small Long

There are lots of really interesting little planets out there in the Kuiper Belt, but Pluto's the only one that's got all the cool attributes.

~ Alan Stern

Alan Stern Interesting Planets Little

I like the planets because they are real places that you can go to and send machines to. Faraway astronomy - galactic astronomy and extra-galactic astronomy - is really cool stuff, but to me, it's about destinations.

~ Alan Stern

Alan Stern Me Real You