Fifteen years ago, a quasar was observed that was found to be located 12 billion light years away. If our universe is approximately 15 billionyears old, when did the quasar emit the light that we observe?O A. 3 billion years agoO B. 12 billion years agoO C. 15 billion years agoOD. 15 years ago The star Sirius is about 9 light-years distant. If the speed of light were half its present value, how far away would Sirius be?A. 9 light-yearsB. 4.5 light-yearsO C. 36 light-yearsD. 18 light-years

According to the guidelines, I can answer only the 1st question.

Answered: Fifteen years ago, a quasar was…

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter29: The Big Bang

Section: Chapter Questions

Problem 10E: Astronomers have found that there is more helium in the universe than stars could have made in the...

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Fifteen years ago, a quasar was observed that was found to be located 12 billion light years away. If our universe is approximately 15 billion years old, when did the quasar emit the light that we observe? A. 3 billion years ago B. 12 billion years ago OC. 15 billion years ago D. 15 years ago