Asked by london
Select ALL the correct answers.
According to the Big Bang Theory, the universe began over 13 billion years ago with an enormous explosion.
Which two of the following observations provide the strongest evidence for this theory?
the redshift of galaxies in all directions from Earth
the brightness and distribution of stars visible in Earth’s night sky
the abundance of iron, lead, and other heavy elements
the constant speed of light throughout the universe
the uniformity of cosmic background radiation
All Answers 1
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Correct choices:
- the redshift of galaxies in all directions from Earth
- the uniformity of cosmic background radiation
Why: The redshift (Hubble's law) shows the universe is expanding from an earlier, denser state. The cosmic microwave background is the leftover thermal radiation from the hot, dense early universe and its uniformity across the sky strongly supports a hot Big Bang.
Why the others are wrong: heavy elements like iron and lead are produced in stars and supernovae, not directly by the Big Bang; the brightness/distribution of night-sky stars and the constancy of the speed of light are not key observational evidences for the Big Bang.
- the redshift of galaxies in all directions from Earth
- the uniformity of cosmic background radiation
Why: The redshift (Hubble's law) shows the universe is expanding from an earlier, denser state. The cosmic microwave background is the leftover thermal radiation from the hot, dense early universe and its uniformity across the sky strongly supports a hot Big Bang.
Why the others are wrong: heavy elements like iron and lead are produced in stars and supernovae, not directly by the Big Bang; the brightness/distribution of night-sky stars and the constancy of the speed of light are not key observational evidences for the Big Bang.
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