The moon may be a familiar sight in the night sky – but because it's tidally locked to Earth, there is one side of the lunar surface we never see.
This side was a mystery for centuries. It wasn't until the Soviet Luna 3 probe visited the area in 1959, that astronomers had any real idea of what it looked like.
Now Nasa has released a stunning animation of the moon's far side - once known as the 'dark side' - with Earth looming in the background.
Heavily edited, of course. To read more, click here.