Add Yahoo as a preferred source to see more of our stories on Google. A malevolent, screaming skull face. A witch cackling in profile. An all-seeing eye, gazing red and furious from the cosmic depths.

Never mind the nature of dark matter or the ultimate fate of the universe, let's address a more important question this Halloween. What's the scariest nebula in the sky? I've seen a few in the flesh ...

Halloween as we know it today has its roots in Samhain, when ancient Celts and Druids in the British Isles marked the end of the harvest and the beginning of longer, darker nights. The last day of ...

The Witch Head Nebula is a large, faint interstellar dust cloud in the constellation Eridanus illuminated by nearby Rigel (at right), the 7th brightest star in the sky.