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30 Cards in this Set
- Front
- Back
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aster
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star
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"onommy"
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knowledge of
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constellation
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pattern of stars in the sky
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Stonehenge
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An ancient monument in southern England. We are not sure of its purpose, but many historians think that it was an ancient structure used to track the seasons.
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our solar system
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the sun and all the planets that travel around the sun
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gravity
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an invisible force that pulls objects towards each other. The Sun, all the planets and their moons have gravity.
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gravitational pull
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the pull that planets (and other objects) have on each other
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Nicolas Copernicus
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scientist in 1510 who had the idea that the earth revolved around the sun
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Galileo Galilei
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an astronomer who believed Copernicus
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NASA
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America's space program
National Aeronautics and Space Administration |
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Hubble Space Telescope
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An enormous telescope orbiting the earth that sends clear pictures of objects in space.
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satellite
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an object in space that travels in circles around another object
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artificial satellite
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a man-made object orbiting the earth
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order of planets
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune,
Pluto (downsized to a ) |
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cosmology
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The study of the structure of the universe.
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"cosmos"
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Greek root word generally understood to mean the universe
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"logos"
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Greek root word for "word". It has been generalized to mean "study of".
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6,000 years
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Generally agreed upon age of the earth by creationists.
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12-14 billion years
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Generally agreed upon age of the earth by cosmologists
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lunar eclipse
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shadow of the earth falling on the moon
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heliocentric
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the idea that the earth and other planets revolve around the sun
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geocentric
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the idea that the sun and everything else revolved around the earth.
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retrograde motion
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the apparent "backward" movement of east to west across the stars of a superior planet when the earth is in opposition (directly opposite)
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inferior planet
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Mercury and Venus
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superior planet
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Mars, Jupiter, Saturn,
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direct or prograde movement
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the apparent "normal" movement of a superior planet from west to east across the stars
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Ptolemy
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2nd century Alexandrian astronomer
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perihelion
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a planet's closest approach to the sun and when it moves the fastest
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aphelion
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a planet's point of furthest distance from the sun and when it moves the slowest
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The Law of Ellipses
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Kepler's First Law:
The path of the planets about the sun are elliptical in shape, with the center of the sun being located at one focus. |
