Nouns
A vehicle to go to space
What's a spacecraft / a spaceship?
to delay an event and plan or decide that it should happen at a later date or time:
to postpone
costing a lot of money:
Expensive
A border between two countries or between what is known and what is not known.
What's a frontier ?
to destroy something completely
To wipe out
Deserted
barren
The state of having or appearing to have no weight; the fact of not being affected by gravity (= the force that makes things fall to the ground)
What's weightlessness?
to send something out, such as a new ship into the water or a spacecraft into space:
To launch
Successful or achieving the results that you want
Effective
A major discovery
A breakthrough
to behave in a way that is intended to attract attention or admiration, and that other people often find annoying:
to show off
Not providing conditions that are good enough to live in or on
Uninhabitable
An important event in History
What's a milestone?
to do something to show that you have power:
to assert one's power
Having a human crew on a mission > a .......................mission
A manned mission