While children dress up as ghosts and goblins for halloween and get their bags and orange plastic pumpkins filled with candy, there's a ghoul in the night sky above and it's called Algol, the Demon ...

In the constellation Perseus the Hero, the star Algol is fun to watch due to its regular changes in brightness. And you don’t even need a telescope. Officially designated Beta Persei, it’s the second ...

Add Yahoo as a preferred source to see more of our stories on Google. While children dress up as ghosts and goblins for halloween and get their bags and orange plastic pumpkins filled with candy, ...