A Blue Moon on Halloween! YAAAAAS!
Don't have to get superstitious or anything, but what is a blue moon anyway? All it means is two full moons have occured in the same calendar month. The last one happened in March 2018. Halloween is unique too. It's a cross-quarter day that falls between the fall equinox and winter solstice. So, get out there and howl at the blue moon!
(The image has no astronomical significance — it’s all for fun! We added a blue filter to the full Moon and the jack-o-lantern image is a photo of the Sun taken by NASA's Solar Dynamics Observatory in 2014.)