The 7 days of 365 Days of Astronomy for week 20 2009. This week the shows include:

• May 14: A Tour of Sydney Observatory by The Skeptic Zone Podcast.
• May 15: Giant Pulses in the Crab by Sue Ann Heatherly.
• May 16: Back to the Dark Ages: Responsible Nighttime Lighting by Connie Walker and Rob Sparks.
• May 17: Citizen Scientists - Making a Difference and Having Fun by Tavi Greiner and Rob Keown.
• May 18: Life of a Proton by Nik Whitehead.
• May 19: When Did Galileo Really Learn About the Telescope? by Mark Thompson.
• May 20: The Missing Cosmonauts by Brian Dunning.