All three statements are supported by cosmic background radiation evidence.
1. It pinpoints the size of the original universe: Cosmic background radiation is considered the afterglow of the Big Bang and is present uniformly in all directions. The observed temperature and the distribution of this radiation provide valuable information about the size of the early universe.
2. It proves that the universe is expanding: The discovery of cosmic background radiation in 1965 by Arno Penzias and Robert Wilson provided strong evidence for the Big Bang theory. The observed redshift of the radiation indicates that the universe is expanding, consistent with the theory.
3. It supports predictions of the composition of the early universe: The measured properties of cosmic background radiation, such as its temperature and spectrum, match the predictions made by the Big Bang theory regarding the composition of the early universe. The radiation's uniformity and isotropy provide further support for these predictions.
Additionally, cosmic background radiation is also considered a form of evidence that verifies that the early universe was once extremely hot. The observed radiation is at a temperature of about 2.7 Kelvin, which is significantly cooler than the initial extremely high temperatures of the early universe. This cooling and the subsequent discovery of the radiation support the hypothesis that the early universe was indeed hot and underwent expansion.
What type of evidence does cosmic background radiation provide about the origins of the universe?(1 point) Responses It pinpoints the size of the original universe. It pinpoints the size of the original universe. It proves that the universe is expanding. It proves that the universe is expanding. It supports predictions of the composition of the early universe. It supports predictions of the composition of the early universe. It verifies that the early universe was once extremely hot.
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