Chief, Astroparticle Physics Laboratory, NASA Goddard Space Flight Center
NASA has given the go-ahead for creation of the Wide-Field Infrared Survey Telescope. It might help reveal the nature of dark energy and point the way to life among the stars. Europe and Russia are celebrating the ExoMars spacecraft now headed for Mars. Emily Lakdawalla tells us why. Spacewalks, re-entry...traveling in space is hard and dangerous! Bruce Betts tells a harrowing tale or two on this week’s What’s Up. Bill Nye is on the road this week.