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54 Cards in this Set
- Front
- Back
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body that revolves around another body
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satellite
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our closest heavenly body
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moon
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another name for moon
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luna
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age of moon
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4.5 billion years old
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albedo (reflection of light) of moon
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11-12 percent
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gravity of moon
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1/6th of earth
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is the moon ..natural or artificial satellite
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natural
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Earth is how many times as massive as moon
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81 times
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and the Moon has (what percent) of Earth Density
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%60
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explain Simultaneous Formation
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Moon and Earth were formed at the same time from the dust cloud the rest of the solar system formed from
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problem with Simultaneous Formation
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two bodies which formed in such close proximity should have the same the make-up
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what is difference between moon and earth make-up
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moon lacks/does not have HEAVY metals
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explain Capture Theory
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Earth’s gravity snagged a passing asteroid and pulled it into orbit
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two problems with Capture Theory
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1)masses of the two bodies-earth and moon and 2) Luna is moving AWAY from Earth.
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usually in capture theory, object moves toward or away from the gravitational object
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toward ----- but moon is moving away
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explain planetoid hit
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planetoid hit Earth, planetoid’s core fell into earth and some of earths crust and mantle along with the remainder of the planetoid went out into space where it formed the Moon
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problems with planetoid hit theory
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none..actually explains heavy metals, core, plate tectonics
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two moon theory
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2010-11 theory that there were two moons that combined nto one moon
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why do they think there were two moons
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moon has two very different halves,,,one side different from other
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what caused moons craters
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meteorites
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long lines extending from craters are called
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rays
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what causes ray fromation
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ejecta or ejections from meteorite hit
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what are mares
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dark looking areas on the Moon that are great out-flows of lava caused by vulcanism or more recent collisions
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people use to think mares were
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old sea beds
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what are Terrae or Highlands—
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caused by being pushed up by collisions or from the contractions of the Lunar surface during cooling
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what do terrae look when viewing the moon
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light colored areas
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what is Regolith
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fine dust caused by the collision of countless meteorites and micro-meteorites over the eons
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is regolith soil
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not really ....fine dust
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explain full moon
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entire disk is visible
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explain quarter moon
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¼ of the disk is reflecting the Sun’s light (quarter=25%=1/4)
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If quarter Moon is decreasing in size it is called a
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WANING CRESCENT
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If quarter Moon is increasing in size it is called a
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waxing moon
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phase of moon where Moon is generally NOT visible
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new moon -does not reflect light
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explain half moon
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1/2 of moon reflects light
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what two sources are responsiblefor tides
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sun and moon
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why does moon causes more affect on earth
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closer
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water is pulled by moon, what about solid rock
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yes solid rock is pulled too
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what causes greatest gravitational effect and highest tides
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spring tides
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do spring tides occur only in the spring
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anytime of year when sun moon and earth are aligned
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whenare tides the lowest
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neap tides
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explain neap tides
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Sun, Moon, and Earth are at right angles to each other...right angle =90 degrees
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explain Diurnal tide
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like gulf coast..one high tide ..one low tide per day
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explain Semi-diurnal tide
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two high and two low tides a day (semi means twice)
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where do semi diurnal tides happen
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Tanzania, Canada, Antarctica- these places are further from equator -closer to polar regions
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what are Mixed semi-diurnal-tides
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there are two high and two low, but the highs are not equally high and the lows are not equally low
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what causes the different tides: three things
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1)shape of the ocean basins, 2)slopes of the shelves,
3)local topography |
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when Moon comes between the Earth and the Sun
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solar eclipse
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solar eclipse only happens in this phase of moon...very rarely happens
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new moon phase
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during a solar eclipse is the only time this part of the sun can be seen
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corona or the outer layer of the sun
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when The Earth comes between the Sun and Full Moon
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lunar eclipse
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phase of moon during lunar eclipse
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full moon
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during lunar eclipse, color earth looks like when covering the moon
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red
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area of maximum shadow, or center or the darkness cast by either the Moon or the Earth
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umbra
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area of LIGHTER shadow, which surrounds the umbra and is not as total dark
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penumbra
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