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Science Vocabulary #10

Across
This word means "like Earth". It describes planets that are rocky and Earth-like in size.
Is the galaxy that contains our solar system. Home sweet home!
A body that produces a coma of gas and dust; a small, icy body that orbits the sun.
A large planet that is mainly made up of gases.
An area of our solar system beyond the orbit of Neptune where a group of minor planets and other objects orbit the Sun.
Down
A nearly round object that orbits a star, This is smaller than a planet, and is not a satellite of another object.
Is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity.
The force that objects exert on each other because of their mass.
A model that is proportional in all respects to the object being modeled.
Is a gravitationally bound entity, typically consisting of dark matter, gas, dust and stars.