This Week in Space (Audio)

Poor Mars. After a warm, wet childhood, the planet dried out and became cold and arid. And why? Mostly because it lost most of its atmosphere, scraped away by solar radiation. NASA's Maven mission studied the phenomenon of atmospheric loss for years, but has now gone silent. Enter Mars ESCAPADE—the Escape and Plasma Acceleration and Dynamics Explorers—twin orbiters that will study the loss of Mart...

Many of us grew up idolizing astronauts as the best of the best that America—and other nations—have to offer. After leaving NASA, many of them go on to relatively routine careers in business or academia, but some stay "on mission" and continue striving to improve the human condition. The 100-plus astronauts behind Astronauts for America, led by Garrett Reisman and Steve Lindsey—a Democrat and Repu...