I Observe a Galaxy That Is 100 Million Light Years

question 9

Multiple Choice

I observe a galaxy that is 100 million light years away. Which of the following do I see?

• A) the light from the galaxy as it is today, and it is blueshifted
• B) the light from the galaxy as it is today, and it is redshifted
• C) the light from the galaxy as it was 100 million years ago, and it is blueshifted
• D) the light from the galaxy as it was 100 million years ago, and it is redshifted
• E) Nothing: the galaxy lies beyond the cosmological horizon.

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