6. The part the astronauts can control is the cargo-carrier.
7. The first STS flight NASA had originally scheduled for April 10 finally lifted off on Sunday, April 12, 1981.
8. The first launch was delayed because of a problem with the computer system the spacecraft used.
9. The astronaut NASA officials chose for the first STS flight had a great deal of experience because of the five other space flights he had made.
10. The STS flight NASA launched in April
1981 was intended to be the first of many shuttle flights the United
States would send up in the following years.
