Concept explainers
Explain all answers clearly, with complete sentences and proper essay structure if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.
Lookback Time and the Ages of Galaxies. Suppose you observe a distant galaxy with a lookback time of 10 billion years. What was the maximum possible age of that galaxy when the light we are now observing from it began its journey to Earth? Explain your reasoning. (Hint: Assume the galaxy was born less than a billion years after the Big Bang.)
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COSMIC PERSPECTIVE FUND.(LL BK+CODE)
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