If you look up at the night sky on Saturday (May 5th) you will see the "supermoon," which is the biggest full moon of the year. A supermoon takes place when moon hits its full phase at the same time it makes its closest approach to Earth for the month. On Saturday night, the moon will be within 221,802 miles of the Earth, which will be its closest approach of the entire year. With the month's full moon timed with the closest approach to Earth, the moon could appear 14 percent bigger and 30 percent brighter than other full moons of 2012. The last supermoon was in March 2011, which was the biggest and brightest full moon in 18 years.