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lecture13 - Astronomy Picture of the Day An amazing...

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Astronomy Picture of the Day An amazing outburst of Comet 17/P Holmes
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Announcements Midterm exam next friday: 25 questions, 50 minutes Remember to bring a scantron form #288 There are 10 left-handed desks in the room. If you want to reserve one for the midterm, please contact me by email. These will be reserved on a first-come, first-served basis.
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UCI Observatory Public viewing night at the Observatory: next friday, November 2, 8-10 pm I’ll give directions next week
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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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Tidal forces on the moon The earth exerts tidal forces on the moon too Note: the tidal distortion of the moon in this figure is highly exaggerated! moon’s orbit this way
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Tidal forces on the moon b a a b
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Tidal forces on the moon If the moon rotated rapidly about its north-south axis, then this tidal stretching would mean that the moon’s structure would constantly be stretched and squeezed by the tidal forces This process would dissipate rotational energy over time Note: the tidal distortion of the moon in this figure is highly exaggerated! a b a b
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Tidal forces on the moon The moon is now tidally locked to the earth in synchronous rotation The moon’s rotation period is the same as its synodic orbital period The same side of the moon is always facing the earth Note: the tidal distortion of the moon in this figure is highly exaggerated!
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