eses unit 2 luna, our moon. warm up write 3 things you know about the moon
TRANSCRIPT
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ESES Unit 2
LUNA, OUR MOON
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WARM UP
• Write 3 things you know about the Moon.
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SOLAR ECLIPSES
• We happen to be alive at a time when the Moon and the Sun are about the same size in the sky.
• This means total solar eclipses are possible – the Moon can completely block out the Sun.
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SOLAR ECLIPSES
• Question: If the Moon revolves around the Earth then why isn’t there a solar eclipse each month?
• Answer: The plane of the Moon’s orbit is not flat relative to Earth’s orbit around the Sun. So some months there are partial eclipses, and most months no eclipse at all.
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LUNAR ECLIPSES
• Since the Earth is much larger than the Moon, it casts a larger shadow, and any time the Moon passes through Earth’s shadow we experience a lunar eclipse.
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PHASES
• Waxing moon – visible segment growing each day
• Waning moon – visible segment shrinking each day
• New moon – all dark
• Crescent moon – a quarter-full
• Half-moon – self explained
• Gibbous moon – three-quarters full
• Full moon – a lovely circle
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PHASES
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CONSERVATION OF ANGULAR MOMENTUM
• The Moon is getting further and further away.
• The Moon’s gravity pulls on the oceans and causes the tides, that creates drag friction on the spinning Earth, causing our rotation to slow slightly.
• Our day gets slightly longer every year.
• If the Earth’s rotation slows down, then the Earth loses angular momentum to the Moon.
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CONSERVATION OF ANGULAR MOMENTUM
• Angular momentum can’t be created or destroyed – it is conserved.
• So if Earth loses angular momentum then the Moon gains angular momentum.
• Moon revolves around the Earth a little faster, and moves into a slightly wider orbit.
• The Moon is receding at 38 mm per year.
• Eventually it will move far enough away that total solar eclipses no longer happen.
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CONSERVATION OF ANGULAR MOMENTUM
• Students having fun! Not in this class, obviously.
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TIDAL LOCKING
• Tidal locking results in the Moon rotating about its axis in about the same time it takes to orbit Earth.
• The Moon always shows the same face to the Earth.
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TIDAL LOCKING