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Study Guide for Test 1

scientific law predicts or describes what will happen under certain conditions
scientific theory an explanation to describe how or why something is happening in the natural world that is supported by many pieces of evidence
geocentric Aristotle and Ptolemy's model of the solar system with the Earth at the center
heliocentric Copernicus and Galileo's model of the solar system with the Sun at the center
solar system our sun the planets that orbit it
orbit the path an object takes around another object in space
Milky Way Galaxy a spiral galaxy that contains our solar system
Big Bang Theory the theory that the universe originated as a single point and then expanded
Red Shift a change in the color of light when an star or galaxy is moving away from Earth
Galaxy a group of stars, planets, gas, and dust held together by gravity
Astronomer a scientist who studies space
Astronomy the branch of science that deals with the study of space
Created by: 100000514433124