When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching Earth, we are seeing that galaxy as it was when the universe was:________.
a) 10 billion years old.
b) 7 billion years old.
c) 4 billion years old.

We see things only when the light from the source hits our eyes. So, if the light which has been received by our eyes has been traveling for 10 billion years then we are actually seeing the galaxy which is 10 billion years old. The galaxy is 10 billion light years away.

Therefore, the answer is a) 10 billion years old.

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Sam1s Sam1s · Answer 2 · 2021-12-13T17:42:05+01:00

a) 10 billion years old.

When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching Earth, we are seeing that galaxy as it was when the universe was 10 billion years old.
So, if the light our eyes received was transmitted 10 billion years ago, we would actually be looking at a galaxy 10 billion years ago. The galaxy is 10 billion light-years away.

Therefore, the correct answer is A.

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When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching Earth, we are seeing that galaxy as it was when the universe was:________. a) 10 billion years old. b) 7 billion years old. c) 4 billion years old.

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When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching Earth, we are seeing that galaxy as it was when the universe was:________.
a) 10 billion years old.
b) 7 billion years old.
c) 4 billion years old.