Crash Course Astronomy: Mercury

Quick: What's the hottest planet in the solar system? You might think Mercury, because it's the closest to the Sun. But in fact, it's not! Venus is hotter due to its runaway greenhouse effect. But that's not to say Mercury isn't loaded with astronomical goodness. It's got a lot going on: craters, rupes, a swollen iron core, and a frosty surprise in its boreal craters. So please watch, listen, and enjoy this week's episode of Crash Course Astronomy: Mercury. And a side note I can't help but menti...