Read the text and answer question.
The US space organization, NASA developed and built
the first space shuttle. The shuttle was the first rocket to
fly into space, come back to earth and fly again. The
first shuttle to fly in space was Columbia. It took off on
[5] the 12th April 1981. In January 1986 the shuttle
Challenger exploded at take-off. Everyone on the
shuttle died. This accident slowed down the shuttle
programme for the next six years. A new shuttle,
Endeavor, replaced Challenger in May 1992.
[10] On 25th April 1990, NASA used the shuttle Discovery
to put the Hubble Space Telescope into space at a
distance of 512 kilometres from the earth. Hubble
travels around the earth and sends back photos of the
stars and planets.
GLOSSARY
NASA — National Aeronautics and Space Administration
The numbers 12th and 25th, underlined in the text, are, respectively: