Animals in space
29 January 2013 Last updated at 18:01 GMT
Animals were the first living creatures sent into space, before humans headed up there.
A monkey sent into space by Iran, in the Middle East, is the latest animal to make the journey there and back.
Some people think it's cruel to send animals into space - especially if they don't make the journey back. But it's widely thought the knowledge gained has helped pave the way for human space travel.