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CH 20 Vocab defined
Ch 20 vocab words
Question | Answer |
---|---|
Objects revolving around the sun that are too small and too numerous to be considered planets. | Asteroid |
The region of solar of solar system between the orbit of Mars, and Jupiter where many asteroid are found. | Asteroid belt |
The initial explosion that resulted in the formation and expansion of the universe. | Big bang |
A ball of ice and dust whose orbit is usually long narrow ellipse. | Comet |
A galaxy shaped like a flattened ball containing only old stars. | Elliptical galaxy |
The name given to the first four outer planets; Jupiter, Saturn, Uranus, and Neptune. | Gas giant |
A description of the solar system in which the planets revolve around the earth. | Geocentric |
The attractive force between two object; its magnitude depends on the distance between them. | Gravity |
The process by which heat is trapped in the atmosphere by water vapor, carbon dioxide , methane and other gases that form a "blanket" around earth | Green house effect |
A description of the solar system in which all of the sun. | Heliocentric |
The tendency of moving object to continue in a straight line or stationary object to remain in place | Inertia |
A galaxy that does not have a regular shape. | Irregular Galaxy |
A chunk of rock or dust in space. | Meteoroid |
A meteoroid that has hit Earths surface | Meteorite |
A streak of sunlight in the sky produced by the burning of a meteoroid in the Earths atmosphere. | Meteor |
The spinning motion of a planet from east to west, opposite to the direction of rotation of most planets and moons. | Retrograde rotation |
A galaxy whose arms curve out ward in a pin wheel pattern. | Spiral galaxy |
The name given to the four inner planets; Mecury, Venus, Earth, and Mars. | Terrestrial planets |
An elongated circle, or oval shape; the shape of the planets orbits. | Ellipse |