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Space Set 1

Key Vocabulary for Space Systems Lessons 1 and 2

TermDefinition
Satellite An object that orbits a planet; any object that orbits around another object in space.
Star A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
Planet An object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit.
Comet A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit.
Constellation A pattern or grouping of stars that suggest the outline of a figure or object.
Geocentric Term describing a model of the universe in which Earth is at the center of the revolving planets and stars.
Heliocentric Term describing a model of the solar system in which Earth and the other planets revolve around the sun.
Ellipse An oval shape, which may be elongated or nearly circular; the shape of the other planets' orbits.
Axis An imaginary line that passes through a planets' center and its north and south poles, about which the planet rotates.
Rotation The spinning motion of a planet on its axis (results in day/night).
Revolution The movement of an object around another object (results in a planet's year as it goes around the sun).
Orbit The path of an object as it revolves around another object in space.
Solstice Either of the two days of the year on which the sun reaches its greatest distance from the equator (Summer Solstice and Winter Solstice).
Equinox Either of the two days of the year on which neither hemisphere is tilted toward or away from the sun.
Gravity The attractive force between objects; the force that moves objects downhill.
Law of Gravitation The scientific law that states every object in the universe attracts every other object.
Inertia The tendency of an object to resist change in motion.
Created by: jbohannon