By Bad Seed
This glorious device propels animals at ludicrous speed. Powered by 73 TNT that are dropped inside a single water trench. A whole mess of redstone connects every racks.
Also the very first step of my space program, still have to hear from pig tho. Watch his launch full-screen and at max resolution, the night is too dark.
UPDATE : Pig and the minecarts were never seen again. I have walked for a few minecraft days in the direction of the launch, with no success. It's time to call off the search. RIP Pig.
Since you all asked for it, see the self-launch here :
Want to launch animals and/or yourself? Get the save here :