6 in total were produced, 3 are still operational today:
Enterprise - was a prototype designed to test Space Shuttle behavior in atmospheric flight.
Columbia - first launched on April 12, 1981. On...
The space shuttle discovery hasn't crashed. The shuttle program has lost two of it's fleet. The first accident happened to the Challenger in 1986. It was caused by a faulty 'O' ring on one of the...
5 NASA Shuttles have been into space. Of those 5 shuttles, 2 were unfortunately destroyed. There has been a total of 135 Space missions using the space shuttle between the years 1980 and 2011 :)