Two astronauts experienced a 7 hour space walk on their Groundhog Day. Plus, Wes and Shawn talk about the Green Comet as well as an asteroid that could potentially hot the Earth in 200 years and cause significant damage to the planet. Rolls-Royce is working on a nucelar generator that could bring power to the Moon and Mars. And finally, SpaceX celebrates a milestone with a launch this morning.