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Astronomy Big 20

TermDefinition
Big Bang The initial explosion that resulted in the formation and expansion of the universe
Meteor A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
Ellipse An elongated circle, or oval shape, the shape of the planet's orbits
Heliocentric A description of the solar system in which all of the planets revolve around the sun
Lunar Eclipse The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon
Asteroid Belt The region of hte solar system between the orbits of Mars and Juptier where many asteroids are found
Waxing The moon is growing
Comet A ball of ice and dust whose orbit is a long, narrow ellipse
Autumnal Equinox The day of the year that marks the beginning of fall in the Northern Hemisphere
Rotation The spinning motion of a planet about its axis
Meteorite A meteoroid that has hit Earth's surface
Solstice The two days of the year on which the noon sun is directly overhead at either 23.5 S or 23.5 N
Meteoroid A chunk of rock or dust in space
Waning The moon is shrinking
Geocentric A description of the solar system in which all of the planets revolve around Earth
Vernal Equinox The day of the year that marks the beginning of spring in the Northern Hemisphere
Inertia The tendency of a moving object to continue in a straight line or a stationary object to remain in place
Revolution The movement of an object around another object
Solar Eclipse The blocking of sunlight to Earth that occurs when the moon is between the sun and Earth
Asteroids Objects revolving around the sun that are too small and too numerous to be considered planets.
Created by: Ms.Rumble215
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