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Leading science journalists provide a daily minute commentary on some of the most interesting developments in the world of astronomy and space exploration. For a full-length, weekly podcast you can subscribe to Science Talk: The Podcast of Scientific American . To view all of our archived podcasts please go to www.scientificamerican.com/podcast

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Title: Giant Energetic Bubbles Adorn the Milky Way

WiggleZ Project Confirms Dark Energy's Effects

May 23rd, 2011

A survey of 150,000 galaxies confirms predictions about dark energy, thought to be what's driving galaxies apart. John Matson reports Go to Episode

What's Flinging Comets Out of the Oort Cloud?

May 31st, 2011

A planet-size object could be behind the odd departure of some comets from the Oort Cloud--and toward us. John Matson reports Go to Episode

Step Right Up and Guess the Star's Age

June 6th, 2011

A database of stars with known ages and spin rates could let astronomers gauge more stars' ages and find the ones old enough to support planets that could… Go to Episode

Fragments of Single Meteorite Show Different Chemistry

June 13th, 2011

The Tagish Lake meteorite fragments contain widely varying organic compounds, a sign that chemical reactions were taking place on board the body in space.… Go to Episode