The most bizarre things happen to matter at pressures millions of times higher than what we feel on Earth’s surface. Physicist Gilbert "Rip" Collins of the Lawrence Livermore National Lab will tell us about recent use of the world’s most powerful lasers to recreate conditions at the cores of giant planets. Emily Lakdawalla looks forward to a Martian encounter with a comet. Bill Nye collects a few grains of stardust—real, interstellar stardust. It’s a big week in space history. Bruce Betts will provide a few highlights just before he and Mat offer up a new space trivia contest.