4.8 • 739 Ratings
🗓️ 6 June 2019
⏱️ 28 minutes
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0:00.0 | Hello, SFIA audio listeners. In this month's Nebula exclusive, big alien theory, |
0:05.2 | we're asking the reason alien civilizations might be rare is because most aliens are huge. |
0:10.5 | To hear it and every episode early and ad-free, plus hours of bonus content, |
0:15.1 | check out go.nebula.tv slash Isaac Arthur and use my code, Isaac Arthur. |
0:20.1 | This episode is sponsored by Brilliant. |
0:23.3 | There's been a lot of discussion over the years about whether Pluto should be categorized as a planet or a dwarf planet. |
0:31.1 | But all of that talk misses the fact that Pluto is something unique in our solar system, a binary planet, and someday it will |
0:40.4 | be a landmark tourist trap. |
0:44.0 | Today we're talking about colonizing Pluto and also other icy dwarf planets and various |
0:50.1 | Kuiper Belt and trans-Neptunian bodies. Throughout this video, I'm going to refer to Pluto as a planet, so I want to say up |
0:58.7 | front that I'm not defying the International Astronomical Union or trying to restart |
1:04.1 | an old argument. |
1:06.0 | Remember, a dwarf planet or minor planet is still a planet, just as our sun is called a dwarf star, |
1:13.8 | but is in arguably still a star. |
1:16.9 | Category names in astronomy have always been a little muddled because astronomers have almost |
1:22.0 | always had to invent categories without knowing all the things they'd eventually have |
1:26.7 | to categorize. |
1:28.4 | Pluto's not the first planet to get reclassified, as we discussed in colonizing series |
1:33.4 | and the asteroid belt, in the first decade of the 19th century, long before we found Pluto, |
1:39.8 | we found Ceres, Vesta, Pallas, and Juno, and dubbed them planets because they orbited |
1:45.5 | the Sun. |
1:47.0 | As we were able to see smaller objects, we noticed far more of them and in an area we called |
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