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Astronomical Unit
-Definition
-Conversions (km, light minutes)
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The average distance from the Earth to the Sun
* 1.496x108 km
* 8 Light Minutes |
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Order of Planets
(closest to furthest from the sun) |
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Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune |
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| Mercury, Venus, Earth, Mars |
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Solar System
(Center>Out) |
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Sun
Terrestrial Planets
Asteroid Belt
Jovian Planets
Kuiper Belt
Oort Cloud |
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Light Year
(Definition and Units) |
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Distance that light can travel in one year
*Distance=VelocityxTime
*9.45x1012 |
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c= 3x108 m/sec
c= 3x105 km/sec |
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June 21
The northern hemisphere receives its most direct sunlight, the sun is highest in the sky. |
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December 21
When the sun is in its lowest point in the sky. |
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March 21
The northern hemisphere goes from being tipped slightly away from the sun to being tipped slightly toward the sun. |
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September 22
Northern Hemisphere first starts to tip away from the sun |
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| # of times a wave moves up and down |
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| Individual "pieces" of light |
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| Spans a broad range of wavelenths without interruption |
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| Emits light only at specific wavelengths that depend on its composition and temperature |
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