Transcript To the Moon!!

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Overview
Quick Facts
Missions to the Moon
Origin Theories
Lunar Phases
Eclipse!
Tides
Legends, Myths, and
Folklore
Quick Facts
• Size -- 2,140 miles in diameter, about
27%the size of earth
• Comprised of -- mostly volcanic
rock, a powdery dust
• Distance from Earth -- 240,250
miles from Earth
Quick Facts (cont.)
• Gravity – moon’s gravity is 17% of
the Earth's gravity (a 100 pound
person would weigh only 17 pounds on
the Moon)
• Atmospheric conditions – no
atmosphere
Missions to the Moon
• Lunar exploration began 1959
• U.S. missions such as Ranger,
Surveyor and Lunar Orbiter
photographed the lunar surface
preparing for astronauts to land
there
• On July 20, 1969, Neil Armstrong
walked on the surface of the moon
during the Apollo 11
Missions to the Moon (cont.)
• Missions Apollo 12-17 focused on
collection of rock samples for analysis
• 1994 a NASA spacecraft discovered
possible water (ice) on the moon
Theories of Origin
• Impact Theory – Earth collided with a
large object (the size of Mars or larger)
sending pieces of the earth into space,
which eventually became the moon (most
widely accepted)
• Coaccretion theory– the Moon formed in
Earth's orbit along with all the other
planets in the Solar System
Theories of Origin (cont.)
• Fission theory – In early days of the solar
system, the earth was spinning so fast that
a piece of the earth flew off and remained
in the earth’s orbit
• Capture theory – the moon was formed
elsewhere in the solar system and was
“captured” by the earth, perhaps by
gravity
What do you think??
Lunar Phases
Why does the moon change shape in the
sky?
We do not see all of the daytime
side of the moon, because the
moon revolves around the earth.
• Moon Phases demonstration from the
Internet
Identify Phases
• New Moon: the new moon is not visible
because the shadow of the moon faces the
earth
Phases cont..
• Waxing Crescent: shaped like a
thumbnail
Phases cont..
• 1st Quarter (first moon):
half moon
Phases cont..
Waxing Gibbous: almost full
Phases cont..
• Full Moon: the entire side of the moon
facing the earth is illuminated
Phases cont..
• Waning Gibbous: is getting smaller
Phases cont..
• 3rd Quarter (Last moon): half moon
Phases cont..
• Waning Crescent: looks like a
thumbnail
ECLIPSE!
• Solar Eclipse: the moon pass directly
between the earth and the sun
ECLIPSE!
• Lunar Eclipse: the earth passes
directly between the moon and the
sun
Tides, Tides, Tides
•The oceans swell due to the gravitational pull
of the moon on the earth
Tides, Tides, Tides
• Sometimes the
difference in
high and low
tide is very
dramatic!
Historical tidal gauge at Anchorage, Alaska where
the tidal range is typically 35 feet. Photo courtesy
of NOAA's Oceanographic Products and Services
Division.
Tides, Tides, Tides
Spring Tide
Neap Tide
Legends, Myths, and Folklore
• Cultural influences and beliefs
– Native American
• Werewolves!
• Can you think of any more?