moon phases - humbleisd.net · microsoft powerpoint - moon phases.ppt author: student created date:...
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![Page 1: Moon phases - humbleisd.net · Microsoft PowerPoint - Moon phases.ppt Author: Student Created Date: 1/10/2012 9:07:27 AM](https://reader035.vdocuments.net/reader035/viewer/2022071218/60537eda07907f2b2c795b97/html5/thumbnails/1.jpg)
Moon phasesMoon phases
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Moon Phases TermsMoon Phases Terms
�� Waxing Waxing –– moon getting biggermoon getting bigger
�� Waning Waning –– moon getting smallermoon getting smaller
�� Crescent Crescent –– moon less than half fullmoon less than half full
�� Gibbous Gibbous –– moon more than half fullmoon more than half full
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What causes phases of the What causes phases of the
moon?moon?�� The orbit of the Moon around the Earth.The orbit of the Moon around the Earth.
�� We can only see part of the illuminated We can only see part of the illuminated
portionportion
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What do we see?What do we see?�� Half of the Half of the
Moon is always Moon is always
illuminatedilluminated
�� Half of the Half of the
moon always moon always
faces Earthfaces Earth
�� Where the Where the
halves overlap, halves overlap,
we see phaseswe see phases
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What do we see?What do we see?�� It takes 28 It takes 28
days for the days for the
moon to make moon to make
a complete a complete
orbitorbit
�� This means the This means the
cycle repeats cycle repeats
once a monthonce a month
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Waxing and WaningWaxing and Waning
�� Waxing Waxing -- Moving towards a full moonMoving towards a full moon
�� Waning Waning –– Moving towards a new moonMoving towards a new moon
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New MoonNew MoonNew moonNew moon
�� When the near side is When the near side is
totally in shadowtotally in shadow
�� Rises at sunriseRises at sunrise
�� Overhead at noonOverhead at noon
�� Sets at sunsetSets at sunset
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Waxing moonsWaxing moonsWaxing crescentWaxing crescent
�� Between new and first Between new and first
crescentcrescent
�� Rises after sunriseRises after sunrise
�� Overhead in the Overhead in the
afternoonafternoon
�� Sets after sunriseSets after sunrise
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Waxing moonsWaxing moonsFirst quarterFirst quarter
�� Between new and fullBetween new and full
�� We see half of the We see half of the
illuminated halfilluminated half
�� Half of half = Half of half = ¼¼
�� Rises at noonRises at noon
�� Overhead at sunsetOverhead at sunset
�� Sets at midnightSets at midnight
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Waxing moonsWaxing moons
Waxing GibbousWaxing Gibbous
�� More than quarter but More than quarter but
less than fullless than full
�� Rises after noonRises after noon
�� Overhead in eveningOverhead in evening
�� Sets after midnightSets after midnight
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Full MoonFull Moon�� When the near side is When the near side is
totally illuminatedtotally illuminated
�� Rises at sunsetRises at sunset
�� Overhead at midnightOverhead at midnight
�� Sets at sunriseSets at sunrise
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Waning moonsWaning moonsWaning GibbousWaning Gibbous
�� Less than full, more than Less than full, more than
third quarterthird quarter
�� Rises after sunsetRises after sunset
�� Overhead after midnightOverhead after midnight
�� Sets after sunriseSets after sunrise
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Waning moonsWaning moonsThird quarterThird quarter
�� Between full and newBetween full and new
�� We see half of the We see half of the
illuminated halfilluminated half
�� Half of half = Half of half = ¼¼
�� Rises at midnightRises at midnight
�� Overhead in early Overhead in early
morningmorning
�� Sets at noonSets at noon
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Waning moonsWaning moonsWaning CrescentWaning Crescent
�� Between third quarter and Between third quarter and
newnew
�� Rises at just before Rises at just before
sunrisesunrise
�� Overhead just before Overhead just before
noon noon
�� Sets just before sunsetSets just before sunset
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Formation of the MoonFormation of the Moon
Where did it come from?Where did it come from?
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Points to keep in mindPoints to keep in mind
�� Any theory of lunar formation must Any theory of lunar formation must
account for:account for:
�� The moon is as old as Earth, The moon is as old as Earth,
�� is made of the same rock as Earthis made of the same rock as Earth
�� Has no waterHas no water
�� Is getting further away from Earth Is getting further away from Earth
�� Has little ironHas little iron
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Did the moon..Did the moon..
�� Spin off from Earth?Spin off from Earth?
�� Form somewhere else?Form somewhere else?
�� Form alongside Earth?Form alongside Earth?
�� Form from an impact?Form from an impact?
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Fission TheoryFission Theory
�� Moon spun off from a rapidly spinning Moon spun off from a rapidly spinning
molten Earthmolten Earth
�� Problem Problem –– EarthEarth’’s gravity should have s gravity should have
pulled the bulge back inpulled the bulge back in
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Capture TheoryCapture Theory�� Moon formed somewhere else and was Moon formed somewhere else and was
captured by Earthcaptured by Earth’’s gravitys gravity
�� Problem Problem –– something would have to slow something would have to slow
down the moondown the moon
�� DoesnDoesn’’t explain lack of water, or moon t explain lack of water, or moon
moving awaymoving away
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Coformation TheoryCoformation Theory
�� Moon and Earth formed side by side from Moon and Earth formed side by side from
same accretion disk.same accretion disk.
�� Problem Problem –– lack of iron, lack of water, moon lack of iron, lack of water, moon
moving awaymoving away
�� Earth would have cleared its orbitEarth would have cleared its orbit
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Giant Impact theoryGiant Impact theory
�� Mars sized planetoid impacted Earth.Mars sized planetoid impacted Earth.
�� Moon formed from debris cloud.Moon formed from debris cloud.
�� Most accepted theoryMost accepted theory
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Giant Impact TheoryGiant Impact Theory
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How do they stack upHow do they stack up
TheoryTheory AgeAge CompositionComposition No waterNo water Moving Moving
awayawayNo ironNo iron
FissionFission
CaptureCapture
CoformationCoformation
ImpactImpact