Listeners hear EarthSky 22 on 22 stations, and counting
Host: Jorge Salazar
Lead Producer: Mike Brennan
ES 22 Producers: Deborah Byrd, Beth Lebwohl, Ryan Britton, Emily Howard
Science News of the Week:
Earthly life arose from space materials, scientists say
Antarctic ice shelf calved icebergs after Tohoku tsunami
Heat-seeking vampire bats hone in on blood
Three-year journey brings Mars rover to rim of crater
Featured stories:
Water on Mars? Jorge speaks with planetary geologist Arthur McEwan of NASA. His team found evidence that may indicate there are salty water flows on certain slopes during the Martian summer.
Alfred McEwen: Possibility of flowing salty water on Mars

Image Credit: NASA
Will planet Mars appear as large as the full moon on August 27, 2011? Deborah Byrd reports.
Editor’s Note: Deborah Byrd made an error in explaining the Mars event. She said that – in 2003 – Mars had not been so close to Earth in millions of years. Actually, it was only 60,000 years. She apologizes for the exaggeration! Read more here: Will Mars appear as large as a full moon in August 2011?

Image Credit: NASA/JPL-Caltech
Bluefin tuna Beth Lebwohl spoke with Bruce Collette.
Bruce Collette on the sad state of tuna stocks
Biofuels in the U.S. Southwest Jorge spoke with Dr. Amy Wolf about the USGS study of biofuel’s potential.
This week’s musical contributors: