Which 2 of the following is an accurate description of cosmic microwave background (CMB) radiation? (1 point)
Responses
A. CMB increases across the universe.
B. CMB is remnant radiation from the Big Bang.
C. CMB is constantly generated by stars.
D. CMB produces differing temperatures across the universe.
B. CMB is remnant radiation from the Big Bang.
D. CMB produces differing temperatures across the universe.
The accurate descriptions of cosmic microwave background (CMB) radiation are:
B. CMB is remnant radiation from the Big Bang.
D. CMB produces differing temperatures across the universe.
To determine which two descriptions of cosmic microwave background (CMB) radiation are accurate, let's take a look at each option one by one:
A. CMB increases across the universe: This statement is not accurate. The CMB does not increase across the universe; instead, it is evenly distributed throughout the cosmos.
B. CMB is remnant radiation from the Big Bang: This statement is accurate. The cosmic microwave background radiation is indeed remnant radiation from the Big Bang. It is the afterglow of the intensely hot and dense early universe, which has since cooled down and stretched as the universe expanded.
C. CMB is constantly generated by stars: This statement is not accurate. While stars do emit radiation, the cosmic microwave background radiation is not generated by stars. It is a pervasive radiation that exists uniformly in all directions in space.
D. CMB produces differing temperatures across the universe: This statement is accurate. The CMB does exhibit slight temperature variations across the universe. These temperature fluctuations are thought to be tiny density variations in the early universe that were amplified over time and eventually became the seeds for the formation of galaxies and other cosmic structures.
Based on the explanations provided, the two accurate descriptions of CMB radiation are:
B. CMB is remnant radiation from the Big Bang.
D. CMB produces differing temperatures across the universe.