Virgin Galactic says hundreds of customers have signed _______ for a brief suborbital flight into space. (điền giới từ)

On 31 May he carried _______ checks on the Kibo JEM Robotic Manipulator System. (điền giới từ)

Yuri Gagarin _______ (become) the first person in space when he _______ (orbit) the Earth in a Vostok spacecraft on April 12,1961.

While she _______ (work) last week, the astronaut _______ (realize) that she _______ (need) a medium - size suit for spacewalking.

SpaceX _______ (send) three tourists on a 10-day trip to the ISS sometime in late 2025.

_______ (you/ ever/ wonder) what it would be like to live on the moon?

Most satellites observing the Earth fly _______ an altitude of 600 kilometers to 800 kilometers above ground. (điền giới từ)

Helen Sharman _______ (send) to the Mir space station in May 1991.

Some meteorites are easy to overlook because they look _______ ordinary earth rocks. (điền giới từ)

Zero Gravity Corp, provides people _______ a once-in-a-lifetime experience of floating in microgravity _______ parabolic flights. (điền giới từ)

NASA announced that it _______ (open) the International Space Station to private individuals as soon as next year.

The centripetal force keeps the planets _______ (move) in their orbits.