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A machine sent into outer space to move around a planet or moon in order to get information about it.
satellite
A part of something or a quality that you can identify in it.
aspect
The mixture of gases that surround a planet.
atmosphere
A large area of land, especially in relation to its appearance
landscape
A large, flat area of land.
plain
A unit of measurement used to measure angles and temperatures.
degree
If you ____ about something, you are curious about it and want to know more.
wonder
Tiny particles of soil and other substances that can fill the air.
dust
The space between two mountains that often has a river in it.
valley
A tool used to do some job such as measuring, detecting, marking or recording.
instrument
When you ____ something, you notice that it is there.
detect
Evidence that something is true or that it exists.
proof
A ____ part of something is the most important part.
fundamental
Very large.
vast
If one thing ____s to another thing, the first thing is the reason that the second thing can happen.
lead to
A person who studies stars and other bodies in the universe.
astronomer
