Total Lunar Eclipse Tonight

For several hours tonight much of North America will be able to view a total lunar eclipse.Completely safe to view with the naked eye, a lunar(Moon) eclipse occurs when the moon passes through a portion of the earth's shadow.The earth's shadow is actually comprised of two parts.{} An outer shadow region, known as the penumbra, where only a portion of suns rays are blocked. {}The inner shadow region, known as the umbra, is a zone where all of the suns rays are block from reaching the moon.Here in Oklahoma the moon will begin to disappear behind the Earth's shadow at 12:33am.and reach total eclipse at 1:41am.{} Totality will last a little over an hour.Locally, viewing the total eclipse will be possible as skies are expected to be partly cloudy through the overnight hours.The last total lunar eclipse visible across all of North America occurred on February 21, 2008. The next total lunar eclipse will take place on April 15, 2014.

You can chat live today with NASA experts in one of two live Web chats hosted by Astronomers.