The Dec. 3 full moon is the first of three consecutive supermoons, including a lunar eclipse. The other supermoons will happen on Jan. 1 and Jan. 31, 2018. You can watch Sunday's supermoon live online here, courtesy of the online astronomy service Slooh or directly from here.
 A supermoon full moon rises over a Russian Soyuz rocket carrying the Expedition 50 space station crew at Baikonur Cosmodrome, Kazakhstan on Nov. 14, 2016. The first of three upcoming back-to-back supermoons will rise on Dec. 3, 2017, NASA says.
Credit: NASA/Bill Ingalls
If you only have time to catch one of them, be sure to check out the "extra-special" Jan. 31 supermoon, NASA said in a statement Friday (Dec. 1). The late January supermoon will take place during a total lunar eclipse visible from western North America, the Pacific and Eastern Asia. It will also be a blue moon, too. [Supermoon 2017 Guide: When and How to See It]
A supermoon occurs  when the full moon is at the closest point of its orbit to the Earth, which is also called the perigee. That makes the moon look extra-close and extra bright — up to 14 percent bigger and 30 percent brighter than a full moon at its furthest point from Earth, called the apogee.
Elizabeth Howell, Contributor