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Astronomy Unit

TermDefinition
Orbit The path of an object as it revolves around another object in space.
Asteroids Objects revolving around the sun that are too small and too numerous to be considered planets
Asteroid Belt The region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found.
Atmosphere The mixture of gases that surrounds Earth. The outermost of the four spheres into which scientists divide Earth.
Axis An imaginary line that passes through Earth’s center and the North and South poles, about which Earth rotates.
Black Hole The remains of an extremely massive star pulled into a small volume by the force of gravity.
Comet A ball of ice and dust whose orbit is a long, narrow ellipse.
Constellation A pattern of stars in the sky.
Galaxy A giant structure that contains hundreds of billions of stars.
Light-year The distance that light travels in one year.
Meteor A streak of light in the sky produced by the burning of a meteoroid in Earth atmosphere.
Meteroid A meteoroid that has hit Earth’s surface.
Milky Way A cluster of stars in which our solar system is found.
Astronomy The study of the moon, planets, stars and other objects in space
Spiral Galaxy A galaxy whose arms curve outward in a pinwheel pattern.
Heliocentric A description of the solar system in which all of the planets revolve around the sun.
Inner Planets The four planets closest to the sun that are small and have rocky surfaces.
Outer Planets The four planets that are further from the sun and do not have solid surfaces: known as the gas giants
Geocentric A description of the solar system in which all of the planets revolve around Earth.
Gravity The attractive force between two objects
Rotation The spinning motion of a planet about its axis.
Revolution The movement of an object around another object in space.
Inertia The tendency of a moving object to continue in a straight line or a stationary object to remain in place.
Telescope a device built to study distant objects by making them appear closer.
Gas Giants The name given to the four outer planets
Big Bang Theory The theory that there was an initial explosion that resulted in the formation of the universe.
Waxing Phase The phases of the moon from a new moon to a full moon.
Lunar Eclipse The partial of total blocking of one object by another.
Gravity The attractive force between two objects
Geocentric A description of the solar system in which all of the planets revolve around Earth.
Created by: Earth6
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