1. NASA astronauts install a new pump module on the International Space Station on Christmas Eve.
That pump weighs over 700 pounds and is the size of your refrigerator!
2. NASA’s Rick Mastracchio and Mike Hopkins are conducting the second spacewalk in four days to repair the ISS’s cooling system. It’s a six-and-half-hour job!
4. Good luck, guys!
NASA astronaut Michael Hopkins, in a photo tweeted by NASA on Sunday, Dec. 22.