What did last week's blood moon eclipse look like from the moon's perspective? University of Pennsylvania astronomy professor Mark Devlin explains what someone standing on the lunar surface would have seen while looking at Earth.

North Americans are about to experience a "tetrad" of lunar eclipses. Starting April 15th, the continent will be witness to a series of four consecutive total lunar eclipses occurring at approximately six month intervals. This is a fairly rare phenomenon as eclipses tend occur about twice each year.