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The Moon. _____Earth’s Satellite_____. Motions of the Moon. Moon rotates and revolves around earth just as earth rotates and revolves around the sun Takes 27.3 days to make one rotation on its axis.. Same time it takes to make one revolution around earth Same side is always seen from earth - PowerPoint PPT Presentation
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The Moon
_____Earth’s Satellite_____
Motions of the MoonMoon rotates and revolves
around earth just as earth rotates and revolves around the sun
Takes 27.3 days to make one rotation on its axis.. Same time it takes to make one revolution around earth
Same side is always seen from earth
Moon shines because of reflection of sunlight (half of the moon is always lite)
Phases of the MoonMoon phases are different forms
that the Moon takes in its appearance from earth
Depends on position of earth, moon and sun
New Moon: lighted half of moon is facing the sun and its in the sky during daylight
Moon rises and sets with the Sun
WaxingAfter new moon the moon rises 15
minutes early each night (12° in the sky)Each night you will see more and more
of the moon, beginning with a sliver of moonlight on right side of moon
Called waxing crescent (waxing means adding more and more of the moon to moonlight
After ½ of moon is seen its called first quarter
To Full MoonAfter first quarter its called
waxing gibbousIt continues until the Sun is
opposite in the sky to the moon and we see full reflections of moonlight at night called full moon
Waning PhaseAfter full moon the phases is
called waningMoon is moving on other side of
the earth and the moon begins to lessen in reflection and the moonlight is on the left side of the moon
Waning gibbous lasts till third quarter
After third quarter its called waning crescent till you see a sliver on left side
Waning PhaseTakes 29.5 days for moon to complete its cycle of phases
◦This is due to earth moving around the sun and it takes longer to get to same phase (extra 2 days)
Position of Moon and phases
Cycle From New Moon
EclipsesCause of solar eclipse is when
the moon lines up directly between the earth and sun
The orbit of the moon is not directly lined up with sun and earth, so only see eclipse a few days each year
Solar EclipseMoon moves in between sun and
earth and causes a shadow across the earth
Might be partial or total eclipseDarkest part of moons shadow is
called umbra (will see a total eclipse)
Preumbra is a light shadow on earth’s surface (partial eclipse)
Solar ecplise
Lunar EclipseEarth’s shadow falls on the moonUmbra shadow on earth results in
total eclipsePreumbra shadow is a partial
eclipse as seen on earth
Lunar eclipse
Solar and Lunar Eclipse
Moon’s SurfaceMoon as it cooled was struck by
meteorites and caused cracks in surface that allowed lava to pour out on surface leaving feature called Maria
These features are 3-4 Billion years old.
These are the youngest rocks on moon indicating that the maria formed after the moon’s surface cooled
Inside the MoonCrust about 60 km (40 miles)
thick
1000 km (666 miles down) is the mantle
Lower mantle (partial molten core) with as solid central iron rich core
Origin of MoonBelieved that moon was formed
as result of a collision of Earth with a Mars size object
Debris of condensing gas resulted that organized as the moon