Space shuttle Discovery, the world's most traveled spaceship, left the International Space Station for its final voyage, Monday.

Discovery got a dramatic send-off by "Star Trek's" original Capt. Kirk.

"Space, the final frontier," actor William Shatner said in a pre-recorded tribute. "These have been the voyages of the space shuttle Discovery. Her 30-year mission: to seek out new science, to build new outposts, to bring nations together on the final frontier, to boldly go and do what no spacecraft has done before."

Astronauts will check out the shuttle wings closely before returning to earth on Wednesday.

Discovery is the oldest of NASA's surviving shuttles and has completed 39 missions for 150 million miles over 27 years.