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SHMS 6th Sci Vocab 4

SHMS 6th Grade Science Vocab 4

TermDefinition
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)
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.
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.
Solar Eclipse This happens when the moon's shadow falls on Earth blocking out the sun's light.
Lunar eclipse This happens when Earth's shadow falls on the moon blocking the moon's light.
Universe All existing matter and space considered as a whole.
Solar System The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy A system of billions of stars, gas, and dust, held together by gravitational attraction.
The Big Bang Theory The theory that the universe exploded from a single point, and has been expanding ever since.
The Milky Way Galaxy The spiral galaxy in which our solar system is located.
Created by: hbogue