Vocab check - space

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another word for to circle, to go around
when you send a rocket into space you _______ it
when you travel from one place to another, usually for a long distance
a long journey, especially by boat or into space
an occasion when you go somewhere and come back
the activity of travelling
the layer of gas that surrounds our planet
not likely to happen or be true
a determined attitude that makes you continue trying to achieve something difficult
a piece of rock that has fallen from space and landed on earth
a vehicle that can travel in space
the force that makes any to objects that have mass move towards each other
a situation in which someone returns to something such as a place or activity
to get or achieve something, usually as a result of a lot of effort; e.g. ~ knowledge
to do a particular piece of work, e.g. an experiment