Stop and take an extra minute to look at tonight's full moon, because it will be the largest one you've seen in almost 20 years.
It's actually called a super "perigee moon," and the last time it occurred was March 1993 (yes it's hard to believe that was almost 20 years ago.) We won't see the next one until 2029.
For more on this head on over to CNN for a brief writeup on the hows and whys, not that scientists really understand how or why.
If you want a much more scientific explanation than head on over to NASA.