There’s a new Planetary Society contest: “Are We There Yet? — Measuring Stardust’s Cosmic Journey.” How far do you think Stardust will have traveled to get to Tempel 1? Guess here and get a chance to win a cool T-shirt! I’m excited to offer this new contest, and want to explain where it came from. Six years ago, the Planetary Society ran a contest for the Deep Impact mission in which we invited people to guess the diameter of the crater that ….