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30 Cards in this Set
- Front
- Back
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Asteroid Belt
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concentrated group of rocks that revolves around the Sun between the inner planets an douter planets
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Inner Planets
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planets closest to the the sun: Mercury, Venus, Earth, and Mars
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Outer Planets
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Planets farthest from the Sun: Jupiter, Saturn, Uranus, Neptune, and Pluto
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Solar System
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grouping space that revolves around the Sun and includes planets, astroids, meteors, and comets
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Orbit
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path a planet follows as it moves around the Sun
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Revolve
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to circle around the Sun (one revolution around the sun equals one year)
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Sun
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large star that is the center of our solar system
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Sun Spots
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storms on the Sun's surface
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Axis
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imaginary line that runs through the center of the earth, and around which the earth rotates on a slite tilt
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Rotate
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to spin or turn on an axis(Earth rotates one every 24 yours)
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Seasons
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variations in temperature and day daylight conditions resulting from Earth's tilt on its axis and its orbit aorund the Sun
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Sundial
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early instrument used to measure time
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Year
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time it takes for the Earth to complete one revolution around the Sun
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Earth
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third planet from the Sun, able to sustain life
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Mercury
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planet closest to the Sun
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Venus
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Second planet from the sun, surrounded by a deadly carbon dioxide atmosphere
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Mars
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fourth planet from the Sun and closest to Earth, has rough crator-like surface
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Jupiter
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fifth and largest planet from the sun, has a giant red spot
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Saturn
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sixth planet from the Sun, has numerous rings
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Neptune
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eight planet from the Sun, covered by cloud layers
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Pluto
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ninth planet from the Sun, is the smallest planet
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Uranus
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seventh planet from the Sun, called the sideways planet
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Crators
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indentations on the surface of the moon
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Moon
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Satallite of Earth
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Moon phases
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changes in the moon's appearance over a month caused by changing amounts of reflected sun light
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lunar eclipse
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occurs when the moon passes through the Earth's shadow
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solar eclipse
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occurs when the moon passes between the sun and Earth
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Asteroids
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rocky bodies smaller than planets that orbit the sun, often minor planets
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Astronomer
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person who studies the sky and its objects
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big dipper
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highly visible part of a larger constellation, often used to locate the North Star
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