Week 21 (May 21 - May 27) - a podcast by 365DaysOfAstronomy.org

The 7 days of 365 Days of Astronomy for week 21 2009. This week the shows include:

* May 21: Hanny's Voorwerp and the Galaxy Zoo by Ted Judah.
* May 22: Mars Exploration: A Quick History by Susan and Amanda Murph.
* May 23: A Cheap "Name a Star" Gift for Graduates by Bruce Palmquist.
* May 24: We're Expanding - and Accelerating! by Brains Matter.
* May 25: Tides: More Than What Floats Your Boat by Robert Morehead from Columbia Astronomy.
* May 26: Astronomer George Ellery Hale by Scott Kardel.
* May 27: Smiley, the Little Dish that Could by Christi Whitworth.

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