Solarsystem
Transcript of Solarsystem
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SOLAR SYSTEM
• 9 Planets – or 8?????• 99.86% mass of the SS isthe sun• Due to the gravitationalpull, the sun is the centralobject
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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
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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
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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.
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Can we make our solar system to scale?
• http://www.exploratorium.edu/ronh/solar_system/
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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.
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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
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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
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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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