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Solar System

QuestionAnswer
Star celestial body that produces its own light consisting of a mass of gas held together by its own gravity in which the energy generated by nuclear reactions in the interior is balanced by the outflow of energy to the surface.
Moon any planetary satellite
Meteor the luminous trail of heated air produced by meteoroids passage through the Earth￢ﾀﾙs atmosphere/ a streak of light caused when a meteoroid or comet dust burns up in the Earth￢ﾀﾙs atmosphere before it reaches the ground.
Satellite natural or artificial body that revolves around a planet
Asteroid a small (1 kilometer to 1000 kilometers), rocky body that revolves around the sun. Also called a minor planet, most asteroids orbit in the asteroid belt.
Planet a spherical body, larger than a comet or asteroid, that orbits the Sun, or a similar body that orbits a different star.
Phases of the Moon the different shapes of the moon caused by changes in the relative position of the moon, Earth, and sun. The phase of the moon you see depends on how much of the sunlit side of the moon faces Earth.
Earth's Tilt 23.5ￂﾰ
Seasons caused by the angle at which sunlight strikes the surface of Earth as it revolves around the Sun. If the Earth were not tilted, it could not occur.
Aristotle Greek scientist who thought that the universe is perfect and finite and that Earth is stationary at its center (geocentric).
Tides the rise and fall of the ocean￢ﾀﾙs water every 12.5 hours or so caused mainly because of differences in how much the moon pulls on different parts of Earth.
Comets chunks of ice and dust whose orbits are usually very long, narrow ellipses
Revolve the movement of one object around another object
Space exploration the investigation of the Universe by spacecraft
Day and Night on Earth caused by Earth￢ﾀﾙs rotation on its axis every 24 hours
Copernicus Polish astronomer who thought that the sun is at the center of the planets. His heliocentric system stated that Earth and the other planets revolve around the sun.
Rotate the spinning motion of a planet on its axis. It takes Earth about 24 hours to rotate once on its axis, causing day and night to occur.
Inertia the force on an object to remain in motion
Orbit Earth￢ﾀﾙs path as it revolves around the sun
Ptolemy Greek astronomer who believed in a geocentric system where Earth is at the center of the system of planets and revolved around the Earth.
Galileo Italian astronomer observed the heliocentric system with a telescope wherein everything in the system of planets revolved around the Sun
Axis The imaginary line that passes through Earth￢ﾀﾙs center and the North and South poles causing the sun and moon to seem to move as if it is rotating on it
Created by: dbwebb
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