Perseus
Perseus, the hero, arcs high overhead in fall and early winter. Many of its stars are immersed in the faint glow of our galaxy, the Milky Way. In fact, if you look at Perseus under dark skies, you may be able to see three of the spiral arms that enfold the Milky Way.
One of the brightest and most interesting stars in Perseus is Algol. The name Algol means "demon star." Ancient skywatchers thought it was cursed because its brightness changes. That's because Algol — which is about 75 light-years from Earth — is the most famous "eclipsing binary" star. Today, astronomers know that Algol is two separate stars. About once every three days, the fainter member of the pair passes in front of the brighter one, and Algol grows fainter.
A faint star cluster in Perseus, called M34 is visible with binoculars.
