The "moon halo" or "moon dog" is fairly common — especially as the weather gets colder. The ring is actually an optical illusion. It is caused when the moon light refracts off ice crystals in a thin ...

Languages: English, Spanish This phenomenon is called a "moon halo." According to the National Weather Service, this ring of light, which is actually an optical illusion, forms around the moon ...

SAN FRANCISCO (KGO) -- Have you ever seen a halo-effect or ring around the moon? Known as a moon ring, a winter halo, or a 22-degree halo, it's when "ice crystals suspended high above in thin ...

Spying a bright Moon with a ring around it high in a cold winter sky is a beautiful, and even spooky, sight. But you can spot Moon halos any time of year — and the same phenomenon occurs with ...

Until this week Saturn's small moon Rhea was the only known solid space object thought to have a ring. (Other known ringed bodies, such as Saturn, are mainly gaseous.) But a new study of optical ...