Finally, Brian was joined in the studio this week by Columbia PhD candidate and NASA astronomy ambassador Cameron Hummels and Derek Pitts, Chief Astronomer at The Franklin Institute in Philadelphia.
Plus, a computer animation sample from a British amateur astronomer who goes by the name Invader Xan. Here's a link to some more videos on his YouTube channel.
For more information about Columbia's Astronomy and Astrophysics program visit their public outreach website
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