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The
Astronomer's Tool
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Before
space travel, looking at lightfrom astronomical objects was the
only way for astronomers to study them
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Careful
study of light lets us measure
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Temperature
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Chemical
composition
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Relative
speed
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After
this lecture, you should be able to answer the questions:
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What
is Light?
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What
are its Properties?
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How
is it Produced?
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What
can it Tell us?
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