Astronomy Cast

Wizzard Media

Science & Medicine, Natural Sciences

Chart Positions

Science & Medicine 37
Natural Sciences 12

Astronomy Cast brings you a weekly fact-based journey through the cosmos.


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

February 15th, 2010

Episode 209 of 489 episodes

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?

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