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Earth, Sun, Moon

orbit/revolution the path one object takes as it revolves around another object in space
crater bowl-shaped indents or cavities on the surface of a planet that are caused by a collision with another object
moon a natural satellite that orbits a planet
sun the star at the center of our Solar System and supplies heat and light to Earth; its gravity keeps the system in orbit
Earth a planet in our Solar System that has life on it
gravity a force that pulls objects toward the center of Earth
celestial body any natural body outside earth's atmosphere
eclipse to obscure the light from or to another celestial body
comet a celestial body of ice and dust, and when near the sun, has a tail of dust and gas particles pointing away from the sun
asteroid a small, rocky body orbiting the sun
star a fixed luminous point in the sky
satellite an artificial or celestial body orbiting the sun or another planet
rotation the time it takes the Earth to make on complete rotation on its axis (24 hour period)
axis a line, real or imaginary, around which something spins
compass an instrument that shows direction and uses a small magnet to show North. (N, E, S, W)
shadow a dark area caused when an object blocks light falling on a surface
sundial an instrument that measures the time of day using the position of the sun
day/night Earth faces the sun and is lit; Earth faces away from the sun and is dark
atmosphere the gases surrounding the earth or another planet
inertia a tendency todo nothing or remain unchanged
revolution/orbit the movement of one object around a center or another object
tilt to cause to lean, incline, slope, or slant
seasons each of the four divisions of the year that result from the earth's changing position with regard to the sun
tide the rise and fall of sea levels caused by the gravitational forces exerted by the moon/sun, and rotation of the earth
Created by: rwilson125