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30 Cards in this Set
- Front
- Back
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the moon revolves around the earth on its...
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orbit
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in what direction does the earth rotate?
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W to E
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what does the earth's rotation show us.
--just what direction does the earth rotate again?? |
why the sun and moon rise in the east and set in the west.
--W to E |
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Describe the orbital period (revolution)
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it's is called the "sidereal" month
--it lasts 27.321661 days |
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how long is the rotational period
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27.321661 days
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What do the orbital period and rotational period have in common
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they are both 27.321661 days
This is why the same side of the moon always faces earth. |
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what is the rotational period
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Yeah what is it? I can't tell from your notes.
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Is the moon rise the same each day?
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No, because the earth is moving at a different rate, moon rise is 50 minutes later each day
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what are invisible points in space not fixed...
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perigee, apogee
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how much time is needed to travel from apogee back to apogee?
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27.55 (and change) days
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what is the lunar month?
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the time needed for the moon to complete one cycle of phases
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Is the lunar month the same time as the sidereal month?
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should be but it's NOT
--why? because the earth is also moving and since the orbits are not circular the lunar month ranges from 29,27 to 29, 83(?) days |
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Is the earth's orbit circular?
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Nope
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Moon phases
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?
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Moon
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barren lifeless rock
- |
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what does the moon do to the earth?
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Instant tsunami-controls earth's tides
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what would happen without the moon?
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water would rush towards the sun.
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what would a quarter moon do on a world previously without a moon?
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make water move hugely
-disrupt water currents |
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what would happen to the earth without the moon?
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earth's tilt would change, changing seasons would lead to ice age
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What does the light from the moon control?
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aquadic life cycles
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what was the earth like long ago before the moon
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molten landscape
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what was the earth made of long ago
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fusing debris
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what was the solar system like long ago?
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in disarray
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what significant event occurred to the earth long ago
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a mars sized comet hit the earth at 25000 m/s
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Is the moon always in the same space from the earth?
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No, it is moving out at a rate of 1/2 inch per year
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How are the tides also affected by the existance of the moon
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tides would be 1/3 of the size
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How would the earth's rotation change without the moon?
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it would spin faster
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How does the earth benefit from the moon in regards to the sun?
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the moon deflects the sun's radiation
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--<confusing>
could create monsters from science fiction |
(ok, ya got me, who put this as a fact????-mom)
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How would the world with out a moon affect the creatures that live on the world?
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complex creatures would not be able to survive
--short thing would survive (ok, ya got me again--what??--mom) |
