Lunar eclipses occur when the moon passes through the shadow of the Earth. There are only two different types of lunar eclipses. The first is a total eclipse which occurs if the entire moon passes through the Earth's shadow, and a partial eclipse takes place if only part of the moon passes through the shadow.
Unlike solar eclipses, lunar eclipses last for a long duration of time, they can last up to 1 hour 40 minutes. Also, they can be seen by anyone on the night side of the Earth, and there is no danger in viewing them.
Why is it red?
In most cases the moon does not become completely dark, but instead it turns a reddish color. The earth's atmosphere which bends part of the sun's light around the Earth and toward the moon. The light is red because the atmosphere absorbs the other colors present in sunlight in greater amounts than it does red.