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Topic 1

Earth Sun Moon System

satellite a body that orbits a planet
star a giant ball of superheated gas, or plasma, composed of hydrogen and helium
planet an object that orbits the sun and is large enough to have become rounded by its own gravity
meteor a streak of light produced when a small piece of rock or ice, known as a meteoroid, burns up as it enters Earth's atmosphere
comet a cold mixture of dust and ice that develops a long trail of light as it approaches the sun
constellation a pattern or grouping of stars that people imagine to represent a figure or object
geocentric a model of the universe in which Earth is at the center of the revolving planets and stars
heliocentric 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 planets' orbits
axis an imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates
rotation the spinning motion of a planet on its axis
revolution the movement of an object around another object
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 north or south of the equator
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 universal gravitation the scientific law that states that every object in the universe attracts every other object
inertia the tendency of an object to resist a change in motion
phase one of the different apparent shapes of the moon as seen from Earth
eclipse the partial or total blocking of one object in space by another
umbra the darkest part of a shadow
penumbra the part of the shadow surrounding the darkest part
tide the periodic rise and fall of the level of water in the ocean
spring tide the tide with the greatest difference between consecutive low and high tides
neap tide the tide with the least difference between consecutive low and high tides
Created by: dougteach65
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