Countdown to Touchdown on Mars

We begin special coverage of the Phoenix mission, landing in the Martian Arctic Circle on May 25. A media briefing featured Principal Investigator Peter Smith, Project Manager Barry Goldstein, NASA Associate Administrator Ed Weiler, and others. Emily Lakdawalla gets you started as planetary scientists in this week's Q&A contribution. Bruce Betts and Mat Kaplan are also rising from the ashes in the lead-up to Phoenix, with a look at the night sky and a new space trivia contest.