Rank these times based on the wavelength of the peak intensity of the cosmic background radiation at those times, from shortest to longest. (Hint: consider how the temperature of the universe or the cosmic background radiation changed with time.)
A) today, 1 million years after the Big Bang, 100 million years after the Big Bang
B) 100 million years after the Big Bang, 1 million years after the Big Bang, today
C) today, 100 million years after the Big Bang, 1 million years after the Big Bang
D) 1 million years after the Big Bang, 100 million years after the Big Bang, today
D
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Essay? Explain what a web-based form is, how companies use them, and how users use them.
What will be an ideal response?
The type of nuclear reaction taking place in stars is
a. cold fusion. b. fusion. c. fission. d. beta decay.
The proton-proton chain is
A) the specific set of nuclear reactions through which the Sun fuses hydrogen into helium. B) the linkage of numerous protons into long chains. C) another name for the force that holds protons together in atomic nuclei. D) an alternative way of generating energy that is different from the fusion of hydrogen into helium.
During the Kelvin-Helmholtz contraction phase, a protostar has a much ________ brightness as compared to the Sun
Fill in the blank(s) with correct word