SAT OwlBecause light travels at a finite speed, the light we see from distant objects left those objects long ago. Light from the Andromeda Galaxy, for instance, takes about 2.5 million years to reach Earth. ______ when astronomers observe Andromeda, they see the galaxy as it appeared roughly 2.5 million years ago, not as it is today.
Which choice completes the text with the most logical transition?
However,
Similarly,
Meanwhile,
Therefore,
Show answer and explanation
Answer: D
If Andromeda's light takes 2.5 million years to arrive, then what astronomers see is the galaxy as it was 2.5 million years ago. The final sentence is a logical conclusion from the previous one, so "Therefore" is correct.
"Meanwhile" suggests something happening at the same time, but the final sentence is a conclusion drawn from the previous sentence.
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