Just going into space is no easy task, but some missions are more daring than others.

It’s one thing to just send a space shuttle up, it’s another thing to attempt to build a rocket powered by nuclear explosions, or prep your cosmonauts for a mission to Mars all the way back in 1956. Those are just a few that pop into our heads.

So what was the most ambitious space program or mission? We’re not restricting ourselves to programs that made it off the ground, so long as they were started in some form. Leave the science fiction for IO9.

However, if you can think of an insane space mission that was planned and started, but was aborted or failed some other way, that’s game.

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