An imaginary sphere that encircles the Earth and which all objects in the night sky appear

An object in the sky, such as the sun, moon, stars, that is outside Earth's atmosphere

Objects that are part of the Earth such as rocks, oceans, and clouds

Observed patterns of stars that people use to mark the positions of stars in the sky

Early model of the solar system in which the Earth is stationary and all other objects in the universe revolve around the Earth.

Modern model of the solar system in which the planets revolve around the sun and Earth has a daily rotation

An imaginary line around which an object rotates is

Spinning of a body around an internal axis

Path of any object around a second object

Orbital motion of a satellite around a second object

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