Engineers built spacecraft that astronauts could live and ___ experiments.
observe
develop
perform
discover
Some satellites are used for communication, GPS, and _________
performing experiments
housing astronauts
weather forecasting
sending people into space
The first international spacecraft is ______
Hubble
Mir
the Apollo-Soyuz
Skylab
______ spacecraft are an integral part of the discovery of our solar system and beyond.
unmanned
effective
scientific
international
In 1961, Yuri Gagarin became the first person to orbit ________
Mars
the Sun
the Moon
the Earth
The Hubble telescope is a _______ that observe the solar system and the universe.
sample
equipment
satellite
space station
In ________, Apollo 11 landed on the Moon.
1949
1959
1969
1979
Yuri Gagarin is a/an ________ astronaut.
Russian
Canadian
American
European