Planetary Radio

There will soon be one thousand confirmed exoplanets, but how do we learn more about such distant worlds? We talk to the leader of a team that has recently developed technology capable of revealing the spectra of these planets, which allows us to tease apart their composition. Emily Lakdawalla invites you to find the next “face” on Mars, while Bill Nye says another asteroid flyby is good news. Our special What’s Up space trivia contest prize will put your picture in orbit!