View Full Version : Ep. 177: Mysteries of the Milky Way, Part 2

2010-Mar-19, 04:50 PM
We survived our first group of mysteries, so now we move onto our second set of stuff of amazing Milky Way mysteries. How many spiral arms does our galaxy have, and why does everything keep dying every 60 million years or so?http://feeds.feedburner.com/~r/astronomycast/~4/7YY6itAJPp0

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