Here is something you don't see every day: a Moon ring encompassing the planet Jupiter. (Click on the image for a bigger view.) Moon rings, also called "winter halos," are a refraction of the moon's light in cloud-hosted ice particles. Last night, Jupiter was serendipitously close to the Moon in the sky, well inside the latter's winter halo.
Speaking of rings and Jupiter, the solar system's largest planet actually does have a faint ring, akin to the vast rings of Saturn. It was discovered in 1979 from Voyager space probe images.
Unfortunately, we cannot see Jupiter's ring from earth, so we will have to be content with the Jovian planet sharing our Moon's icy halo in the sky.
