without special help? No. any living thing expoused to the vacum of space would die in a horrible way, its organs would expand and burn up and their muscles would stretch out and break.
Ancient cultures long ago reported seeing aliens. Some mistook them for their Gods, though, like Egyptians. Native Americans said that aliens helped them build their pyramids that stand thousands of...
If you mean aliens, then there are for sure some aliens in there. If you mean humans then there are some spacemen in space stations on Earth orbit who keep the space stations working.
It's possible on some, but others would not allow us to do that.
If we moved to another planet, we'd have to have all the stuff we "normally" need to live already on the planet, be able to take it...