Galacticraft
Link: Minecraft Forum
I’m sure you can guess what this mod is about through the name alone but Galacticraft takes players out of their world and into space. For starters, players will begin the Minecraft world as normal, it’s only when a rocket is crafted that gamers can travel into space and land on the moon. While on the moon, there are a few requirements to keep your adventuring going such as building an oxygen generator or masks to keep your character full of fresh air.
Besides the moon, players can travel to Mars, an asteroid, or the Space Station, of course that all depends on the type of rocket player craft. Developers behind the mod have noted that while there are only a few destinations available for travel, future releases will include new planet locations.