Already known for attempting to tackle such ambitious goals as landing a reusable rocket and sending a manned mission to Mars, SpaceX announced Monday that it was planning to send a pair of private citizens on a trip around the moon by the end of next year. , the proposed orbital flight would be 100% self-funded, would take place in late 2018 and would use the Falcon Heavy booster rocket – which, it should be noted, has yet to be flown.