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Episode 45: Defining Planets

Play Jul 13•4:18

So what is a planet, exactly? Sure, we're familiar with Earth and Mars, Jupiter and Saturn. But recently astronomers have been discovering strange, small worlds at the far edges of our solar system. Some are close to Pluto in size - one is actually bigger. Do they all get to be called planets? If so, improving detection techniques could leave us with hundreds, even thousands, of "planets." A...

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