People in parts of the UK and around the world have had a rare chance to see a total lunar eclipse. The moon is normally lit up by the sun's light...
...but during a lunar eclipse, the moon passes through the shadow that's created by Earth blocking out the sun's light.
Though most of the sun's light is blocked out by Earth, some sunlight can get through indirectly and that makes the moon look red!
This happened on 21 December 2010, which is the Winter Solstice. It's shortest day of the year and officially marks the start of winter.
It's been three years since the last total lunar eclipse and nearly 400 years since it happened on the Winter Solstice!