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Mars Rover Lesson 1 Vocabulary List Teacher Definitions Key Vocabulary apply: use what you have learned in a different way, place or time astronomical: (meaning 1) of or pertaining to the study of stars planets and extraterrestrial matter (meaning 2) a very large number or amount scale: the ratio or constant of proportion between a copy of an object that is either larger or smaller than the original and the original ADDITIONAL WORDS apoastron: the point in an extra-Solar planet’s revolution when it is furthest away from its star astrology: a belief that the positions and movements of the stars, moon and planets might influence events and the lives and behaviors of people. Modern Western astrology is based on a Babylonian religion that held, in part, that the location of the Sun, Moon and planets at the time of one’s birth determines one’s fate in life. ecliptic plane: the plane of the Earth’s orbit ecliptic pole: the apparent location among the distant stars pointed to by a line perpendicular to the ecliptic plane through the center of the Earth’s orbit. periastron: the point in an extra-Solar planet’s revolution when it is closest to its star