Only when the moon, Earth and the sun are perfectly aligned is the moon 100% full. And sometimes — once in a blue moon — the moon is full twice in a month (or four times in a season ...

From fiery 'blood moons' to ancient legends, discover the surprising science and history behind lunar eclipses.

Every time we go four times around the sun, it has almost ... the entire Earth-Moon system — which is not to say that we don't know a lot about it. In fact, we know a lot about it.

Oh, and the calendar started the moment Neil Armstrong walked on the moon ... fact? You probably think of Earth as located in ...

Exactly two weeks after the "blood moon" total lunar eclipse comes a partial solar eclipse visible to some in North America.

The phenomenon of a Full Moon arises when our planet, Earth, is precisely sandwiched between the Sun and the Moon ... Note: Moon phases in the calendar vary in size due to the distance from ...