The European Space Agency's Planck spacecraft has reached a milestone in its investigation of our universe's origin and much more. Project Scientist Jan Tauber explains the mission and what it hopes to accomplish. Bill Nye reports on his visit to the Arecibo radio telescope in Puerto Rico, the biggest single dish on Earth by far. Has a Russian scientist found signs of life on hostile Venus? Emily Lakdawalla says no. Bruce Betts and Mat Kaplan view the current night sky and offer a new space trivia contest.