Space shuttle Atlantis lands at the Kennedy Space Center in Cape Canaveral, Fla., July 21. The landing of Atlantis brings the space shuttle program to an end. (John Raoux/AP)

The era of the space shuttle is over. Atlantis, the final U.S. space shuttle to leave Earth landed safely Thursday morning.

But what comes after the space shuttle? Some, including astronaut John Glenn, have argued that bringing NASA’s space shuttle program to an end is a mistake — that there is more work yet to be done in space. Others have argued that the shuttle program should end, and that it is now time to put the minds at NASA to use on other programs. And private companies, such as Sir Richard Branson’s Virgin Galactic, are already making inroads on private space flight. But be warned, tickets currently go for $200,000 with deposits starting at $20,000.

But what do you think? What is the next innovative idea when it comes to space travel? Is is Mars? Is it another lunar landing mission? Let us know in the comments or ping us at #SpaceFuture on Twitter.

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