Tonight: A Supermoon Lunar Eclipse . ... Credit Copyright: NASA 's GSFC , David Ladd ( USRA ) Krystofer Kim ( USRA ) Explanation: Tonight a bright full Moon will fade to red. Tonight's moon will be particularly bright because it is reaching its fully lit phase when it is relatively close to the Earth in its elliptical orbit . ... However, our Moon will fade to a dim red because it will also undergo a total lunar eclipse -- an episode when the Moon becomes completely engulfed in Earth's shadow. ...