Choose the best answer.

Landing on a comet was one of the most ___________ space mission in the history.

Choose the best answer

He completed two ................ in his career as an astronaut.

Choose the best answer

A ................ body is a natural object which is located outside of Earth’s atmosphere, such as the Moon, the Sun, an asteroid, planet, or star.

Choose the best answer

How often do you watch the Discoveries channel on TV? - ................

Choose the best answer

A __________is an enormous system of stars in outer space.

Choose the best answer

Christer Fuglesang said he enjoyed floating around in the ________ environment.

Choose the best answer

In July of 1975, the first US-Soviet joint ____________occurred with the Apollo-Soyuz project.