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doit_the_clown doit_the_clown
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7 years ago
Because of the travel time of light, we see more distant parts of the universe as they were when the universe was younger, but we cannot see back “into” times when the universe was opaque and light could not travel freely. Using photons, then, what is the furthest back in time that we can see as we look out into the universe?
A)   To a time 1/1,000,000 sec after the start of the Big Bang
B)   To a time 500,000 years after the start of the Big Bang
C)   To a time 3 min after the start of the Big Bang
D)   To a time 3000 years after the start of the Big Bang
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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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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papachulopapachulo
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7 years ago
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doit_the_clown Author
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7 years ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Fanmkreyol
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Yesterday
You make an excellent tutor!
Tim0301
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2 hours ago
Brilliant ツ
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