lecture13 - Astronomy Picture of the Day The NGC 7822...

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Astronomy Picture of the Day The NGC 7822 star-forming region
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The Moon
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The Moon Average Earth-Moon distance: 384,000 km Mass is 1.2% of the Earth’s mass Radius is 27% of the Earth’s radius Weight of an object on the moon’s surface is about 17% of the weight of the same object on earth
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Tides High and low tides at the Bay of Fundy in Canada
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The Tides Tides are the result of the differential gravitational pull of the moon on different parts of the earth F = Gm 1 m 2 d 2 The moon’s gravitational pull is stronger on the side of the earth closest to the moon, and weaker on the opposite side stronger pull on this side weaker pull on this side
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The Tides N S the moon’s average gravitational pull on the earth
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The Tides stronger pull on this side weaker pull on this side N S (note: these diagrams are not drawn to scale!) average pull on center
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The Tides The oceans can fow in response to these tidal Forces N S on this side, the oceans are pulled away From the earth on this side, the earth is pulled away From the ocean The diFFerential gravitational pull on diFFerent parts oF the earth, relative to the average gravitational pull , is responsible For the tides
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N Motion of the tides during 1 orbit of the Moon
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N The tides over a 24-hour period: looking down at the Earth’s north pole
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lecture13 - Astronomy Picture of the Day The NGC 7822...

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