Transcript
SOLAR SYSTEM
• 9 Planets – or 8?????• 99.86% mass of the SS isthe sun• Due to the gravitationalpull, the sun is the centralobject
Gravity’s Influence on Orbits
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EARTH’S MOTIONS
• Rotation – Earth rotates on it’saxis (23.5 degree tilt)• This causes day and night – 24hours
Seasons
• The tilt of the earth causes the seasons
• Because of the tilt to the sun’s position relative to the equator constantly changes.
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Tilt of the Earth
Moon, Earth and Sun
• • Scaled Model• • Sun 28’ in diameter• • Earth 8 cm in diameter• • Moon 2 cm in diameter• –If the globe is used to represent• Earth, the Moon would be about• 3” in diameter and would need to• be 30 feet away from the Earth.
Can we make our solar system to scale?
• http://www.exploratorium.edu/ronh/solar_system/
Earth’s Moon
• The moon rotates and revolves at the same rate = 27.3 days
• Same side of the moon always faces the Earth
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Eclipse
• Occurs when the Earth or moon temporarily blocks the sunlight reaching the others.
Solar Eclipse
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Solar Eclipse
• Occurs when the moon moves directly between the sun and the Earth and casts a shadow on part of the Earth
• Only involves .5% of the Earth’s surface
Lunar Eclipse
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Lunar Eclipse
• Occurs when the Earth passes between the sun and the moon and blocks sunlight from reaching the moon
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Ocean Waves
• 2 types• Wind – height will depend on speed, distance
and length of the wind blowing• Tides – gravitational force of the moon, sun
and Earth– Tides are long waves that result in the periodic
change in the surface level of the ocean. – Some areas experience 2 high tides and 2 low
tides
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Tides
• Tidal Range is the difference between high and low tides.
• The moon’s gravity exerts a strong pull on the Earth and causes high tides.
• The rotation of the Earth causes the movement of the tides.
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Earth–Moon–Sun Positionsand the Tides
Tides
• Spring Tides – Moon, Earth and Sun are lined up– High Tides Higher– Low Tides Lower
• Neap Tides – Moon, Earth and Sun form right angles– High Tides Lower– Low Tides Higher
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