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SHMS 6th Grade Science Powertime Vocab 4

Geocentric model (geo means Earth) Earth centered model of the known universe. The belief in ancient Greece that the stars, planets and sun revolved around the Earth which did not move. Associated with Aristotle and Ptolemy
Heliocentric model (helio means sun) Sun centered model of the known universe. The planets revolve around the sun. Copernicus was 1st accredited with this model. Galileo supported it, as did Kepler and Newton.
Gravity The force of attraction between all masses in the universe. It governs all motion in the solar system.
Comets small objects, that orbit the sun, made mostly of ice with bits of rock and metal. They have a glowing tail that of gas and dust. It has a predictable orbit.
Asteroids a small, rocky, irregularly shaped bodies that orbit fairly close to the sun.
Meteors A tiny rock in space, which becomes a meteorite when it enters a planet’s atmosphere
Rotate when an object spins around an axis (the Earth makes a complete rotation on its axis in 24 hours)
Revolve when an object makes a complete circle around another object (It takes the Earth 365 days to go around the sun)
Solstice When the Sun is farthest from the equator (2 times per year
Equinox When the Sun crosses the equator (2 times per year
Polaris the north star that appears to not move due to the northern point of Earth’s axis pointing in the direction of the star
Equator The imaginary line that runs around the middle of Earth. This is where the most direct sunlight hits Earth.
North Pole The northern most point on Earth’s surface.
South Pole The southern most point on Earth’s surface.
Hemisphere Either the top half of the Earth (northern), or the bottom half of the Earth (southern). The two halves are divided by the equator.
Created by: hbogue