In honor of tonight's 'Blue Moon,' astronaut Scott Kelly aboard the International Space Station posted this image and wrote, "TGIF Here's a preview of tonight's rare celestial surprise. #BlueMoon on the rise. #YearInSpace."
'Once in a Blue Moon' typically means rare or absurd. This year, it means tonight! According to modern folklore, the second full moon in a month is a "Blue Moon." But of course that doesn't mean it's necessarily blue. Step outside at sunset, look east and see what color presents itself.
To learn more about 'Blue Moons,' watch: https://youtu.be/XyBp-EYrwTA