A Lucky Lunar Eclipse
Credit and Copyright: Andy Steere
Lunar eclipses are caused when the Moon passes through the Earth's shadow. Although dimmed, the eclipsed Moon may not appear completely dark. Sunlight scattered into the Earth's shadow after passing around the planet's edge and through its dusty atmosphere can make the Moon take on dramatic shades of red during totality as demonstrated in the above photo of the November 1993 lunar eclipse.
You can find this photo and other exciting images on the Astronomy Picture of the Day web site. Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.