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Stars
Messages from the Stars
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Stars
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Vary in size, color, and temperature
 Color can indicate the size, temperature,
and life span of the star.
Pass through stages (Depends on its mass)
Consist mainly of helium and hydrogen
Messages from the Stars
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Why do stars shine?
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They’re burning and nuclear reactions are taking
place in the core.
Products given off by the reaction.
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Heat
Light
Radiowaves
Radiation
Messages from the Stars
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Life on a smaller star
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Begin as a nebulae (giant cloud of gas and dust)
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Turns into a star
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Gravity squeezes the clumps of gas and dust together with
so much friction/pressure that it caused them to begin to
glow and get hot.
Sizes can vary
Red Dwarf
White Dwarf
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Small white star formed after all the surface gas is gone.
Messages from the Stars
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Life of a larger star
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Begins as a nebulae
Turns into a star
Turns into a red super giant
Turns into a supernova (death of a star)
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Visible for 1-2 years
Turns into either a neutron star or a black hole.
After all helium is gone, stars either blow
up, shrink, or go cold.
Sizes of Stars
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Red Super Giant
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Diameter = approximately 973 million km
Red Giant
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Diameter = approximately 64 million km
Colors of Stars
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The color of the star is related to the
temperature at the surface.
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The coolest stars have a reddish color and the
surface temperature of about 3000° C
The hottest stars have a bluish color and a
surface temperature of over 40,000° C
Mapping the Night Sky
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Star Charts
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Ways of tracking where the constellations are
located during the different seasons of the year.
Remember as the earth revolves around the sun,
it also rotates causing the stars to “shift” in the
night sky.
In actuality the stars are in the same place, it is
just the earth that has rotated.