500 days—or thereabouts: That's the amount of time between now and the final flight of the awesome Space Transportation System, better known to you and me as the Space Shuttle. Here's what comes next...

It's such a short time before the skies over Florida will no longer thunder to the sound of the Space Shuttle's main engines under full thrust. But that doesn't mean that after September 16, 2010, there will be any letup in the requirements to put people and hardware into orbit. What ships are in line to hop into the venerable old Shuttle's shoes? Five, at last count, all with their own talents and differences.

Check out each photo in the gallery, a dossier of facts about the next vehicles that will take us and our crap into orbit, and possibly to the moon and Mars: