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Astronomy Vocabulary

TermDefinition
Axis And imaginary line that passes through Earth’s North and South poles about which Earth rotates
Rotation The spinning motion of a planet on it’s axis
Revolution The movement of an object around another object
Orbit The path of an object as it revolves around another object in space
Solstice The two days of the year on which the sun reaches its greatest distance North or South of the equator
Equinox The two days of the year which the two hemispheres are neither tilted toward or away from the sun
Gravity The force that pulls objects toward each other
Law of Universal Gravitation The law that states every object in the universe attracts every other object
Mass The measure of how much matter in is an object
Weight The measure of the force of gravity on an object
Inertia The tendency of an object to resist any change in its motion
Newton’s First Law of Motion The scientific law that states and object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted upon by a force
Phase a distinct period or stage in a process of change or forming part of something's development
"the final phases of the war" Eclipse an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination
Solar Eclipse an eclipse in which the sun is obscured by the moon
Umbra the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse
Penumbra the less dark outer part of a sunspot, surrounding the dark core
Lunar Eclipse an eclipse in which the moon appears darkened as it passes into the earth's shadow
Astronomy The studies of stars, galaxies, and other stuff in space;
Created by: WaffleFish13
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