US
Nasa needed more orbiters. This was the second shuttle built and was the first that was used for testing then converted to space flight. It was send into space for the same purpose as Challenger before it and the ones after it.
Canada has never sent a Space Shuttle into space.
Space Shuttle Discovery.
The debris from Space Shuttle Challenger is buried under a missile silo in Cape Canaveral AFB in Merritt Island, Florida. The remains are buried in 2 underground 80 ft. deep minuteman missile silos on abandoned launch complex 31/32.
The space shuttle Discovery has flown the most times of all the space shuttle orbiters.
The first space shuttle sent into outer space was the Space Shuttle Columbia. It was launched on April 12, 1981, as part of the STS-1 mission.
Australia hasn't sent its own astronauts, but some astronauts that were born in Australia have been in space with missions from other countries. Paul Scully Power was on the Space Shuttle Challenger in 1984. He was born in Sydney. Andrew Thomas was born in Adelaide and he has been on several Space Shuttle missions and was also on Russia's Mir space station. = =
atlantis
The last Space Shuttle to go into space and to the Space Station was Endeavour
Columbia was the first space shuttle sent into space on April 12, 1981, exactly 20 years to the day after Yuri Gagarin became the first man in space.
Columbia, Challenger, Discovery, Atlantis, and Endeavour.
Columbia, Challenger, Discovery, Atlantis and Endeavour.