Physics, 25.04.2020 04:06 sophx

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 Ea...