NASACast combines the content of all the NASACast subject area podcasts into a single omnibus podcast. Here you'll find the latest news and features on NASA's missions as well as the popular "This Week @NASA" newsreel.
http://www.nasa.gov/
Gravity Assist: She Protects Other Planets from Our Germs
As we explore Mars and other places in the solar system that might have life, scientists who work in Planetary Protection are busy making sure that we don’t contaminate them.