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Home Q & A Board Science-Related Homework Help Physics
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doit_the_clown doit_the_clown
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7 years ago
Measurements suggest that light first arrived at the Earth from the Cassiopeia A supernova about 300 years ago and that this supernova is about 10,000 ly away from the Earth. When did the explosion actually occur?
A)   It is not possible to say when it occurred from the information given.
B)   9700 years ago, or about 7700 B.C.
C)   10,300 years ago, or about 8300 B.C.
D)   300 years ago, or about 1700 A.D.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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