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Sun, Earth, and Moon

Across
One of the oldest sciences in the world. Includes the study of the sun, Moon, planets, stars, galaxies, and all other matter in the universe.
The star at the center of our solar system that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit.
Characteristics that can be observed or measured; for example, temperature, size, composition, and gravity.
The planet that all known life exists on.
Bowl-shaped indents or cavities on the surface of a planet, moon, or asteroid that are caused by a collision with another object, such as a meteorite.
Down
The heaviness of an object; force of gravity on mass = weight.
A natural satellite that orbits a planet.
The layer of gas surrounding planet Earth; held in place by gravity and composed of a limited number of elements – primarily nitrogen and oxygen.
The outermost covering or layer.
A celestial body orbiting the earth or another planet.