Just when you think you're done being impressed by what people can do with Minecraft, somebody comes along with a mod that literally takes the game to another world.
Galacticraft is a mod released earlier this year that turns your little Minecraft dude into an astronaut, able to jump into a rocket, fly above the world and then visit the other planets and moons of the Solar System.
There is flight. There is hostile atmosphere. You can see the sun, and if you're on our moon, the Earth. You even leave footprints in the moondust as you walk around. Amazing.
If the video above doesn't start at the right spot, you're going to want to jump to around 16:51 to see the lunar landing.
You can grab the mod here.