Radiation from the early history of the universe was stretched by the expansion of the universe until

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Radiation from the early history of the universe was stretched by the expansion of the universe until today it is in the form of

a. X-rays
b. Ultraviolet waves 

c. Infrared waves

d. Radio waves

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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