It's time for my favorite holiday tradition: the 2013 Hubble Space Telescope Advent Calendar. Every day until Wednesday, December 25, this page will present an amazing new image of our universe from NASA's Hubble telescope. Be sure to bookmark this calendar and come back every day until Christmas, or follow on Twitter (@in_focus), Google+, Facebook, or Tumblr for daily updates. I hope you enjoy these amazing and awe-inspiring images and the efforts of the science teams who have brought them to Earth. Merry Christmas, and Peace on Earth to all. (Also, choosing the "1280px" viewing option below, if you can support it, is always a good option.)