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22 Cards in this Set
- Front
- Back
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As the moon goes around the earth the same side of the moon always faces the earth. T or F?
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True
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What is period of rotation?
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Time for a planet to make one full turn on its axis
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Larger planets tend to spin faster = shorter days T or F?
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True
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What is the force keeping us in orbit around the sun?
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Gravity
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It's day when we face the sun and its night when we face the sun. T or F?
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FALSE.
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Rotation is.......
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The earths spin on its axis.
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solstice
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when one hemisphere is tilted most towards and most tilted away from the sun
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Distance between two objects increases as gravity decreaes. T or F
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TRUE
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Larger Mass exerts more _______.
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gravity
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Planets want to travel in a ____ line.
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Straight
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The suns ____ and the planets _____ have to be balanced so the planets continually orbit the sun.
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gravity, inertia
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What is gravity?
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from sun keeps planets from flying off into space in a straight path
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What is an Equinox?
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point in Earth’s orbit when it is tilted neither toward or away from the sun
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What are the two equinoxs?
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vernal and autumnal
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When is the vernal equinox?
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March 20 or 21 (first day of spring)
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When is the autumnal equinox?
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September 20 or 21 (First day of fall)
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What is a solstice
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the point in Earth’s orbit when a hemisphere is tilted most toward or away from the sun
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When is the summer solstice?
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June 20 or 21 (First day of summer)
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When is winter solstice?
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December 20 or 21 (First day of winter)
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What position is the earth in during winter solstice?
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Northern Hemisphere is tilted away from sun
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What position is the earth in during summer solstice?
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Northern Hemisphere titled most toward the sun
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Supernova
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Explosive death of a high mass star
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