Two years ago, when residents of a small Italian town watched a mysterious halo of red light in the skies, no one could explain it. Now the same phenomenon has returned and was seen once again on ...

An e-mail asks about the spots of colored light and halos sometimes seen in thin clouds and how that differs from rainbows. Although ice crystals in those high, thin clouds disperse light in the same ...

Astronomers have found an enormous halo of stars bound to the Andromeda galaxy and extending far beyond the swirling disk seen in images of the famous galaxy, our nearest large galactic neighbor. The ...

Night isn’t the only time to see gorgeous things in the sky. Some of the most awe-invoking heavenly phenomena can only happen during the day, when the sun is shining. If you live in a place where you ...