The moon rises behind Lisbon's Saint George Castle in Portugal as night falls Saturday, March 31 2018.
The moon rises behind Lisbon's Saint George Castle in Portugal as night falls Saturday, March 31 2018. Armando Franca AP Photo
The moon rises behind Lisbon's Saint George Castle in Portugal as night falls Saturday, March 31 2018. Armando Franca AP Photo

Don't worry, your eyes are fine. Why tonight's ‘double blue moon’ won't look blue

March 31, 2018 06:08 PM