A rare blue supermoon is pairing up with Saturn this week for an astronomical two-for-one. The cosmic curtain rises Wednesday night with the second full moon of the month, the reason it's considered blue. It's dubbed a supermoon because it's closer to Earth than usual, appearing especially big and bright. This will be the closest full moon of the year, a little over 222,000 miles away. Saturn will be peeking from behind as a bonus. Better catch the show if you can. There won't be another blue supermoon until 2037.
