Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies.
B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero.
C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old.
D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.
Question 2
The interstellar clouds called molecular clouds are ________.
A) clouds that are made mostly of complex molecules such as carbon dioxide and sulfur dioxide
B) the clouds in which elements such as carbon, nitrogen, and oxygen are made
C) the cool clouds in which stars form
D) the hot clouds of gas expelled by dying stars
TrUe....FaLsE
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