A lunar eclipse is when the full moon, in its revolution around the earth, get positioned behind the planet away from the sun. When it passes through the shadow of the earth, it looks dark and reddish in color.
Next Generation Science Standards Connection
ESS1. A The universe and its stars
ESS1. B Earth and the solar system
Patterns of movement of the sun, moon, and stars as seen from Earth can be bserved, described, and predicted