BLUE MOON & JUPITER: Tonight's Blue Moon has a companion: Jupiter. All night long, the giant planet will be located right beside the Moon. You can see them with the naked eye or, for a real treat, scan the pair with a backyard telescope. Behold the moons of Jupiter, lunar mountains and craters, and maybe even the Great Red Spot: sky map.

BONUS: Blue Moons are supposed to be absurd, but on May 21st, the Moon over Vecsés, Hungary, really did turn blue. "It was a unique and unforgettable sight," says photographer Ágnes Kiricsi who took these pictures: #1, #2, #3. The display was caused by a Sahara dust storm that filled the air above Hungary with micron-sized dust particles. Clouds of fine dust can act as a color filter, turning the Moon (or Sun) blue: more.