Question
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 brightness and distribution of stars visible in Earth’s night sky
the abundance of iron, lead, and other heavy elements
the uniformity of cosmic background radiation
the redshift of galaxies in all directions from Earth
the constant speed of light throughout the universe
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 brightness and distribution of stars visible in Earth’s night sky
the abundance of iron, lead, and other heavy elements
the uniformity of cosmic background radiation
the redshift of galaxies in all directions from Earth
the constant speed of light throughout the universe
Answers
GPT-5 mini
- the uniformity of cosmic background radiation
- the redshift of galaxies in all directions from Earth
Reason: The cosmic microwave background is the remnant radiation from the hot, dense early universe, and the redshift of galaxies shows the universe is expanding (extrapolated back to a hot, dense state). Heavy elements were produced later in stars, and the other choices are not key Big Bang evidence.
- the redshift of galaxies in all directions from Earth
Reason: The cosmic microwave background is the remnant radiation from the hot, dense early universe, and the redshift of galaxies shows the universe is expanding (extrapolated back to a hot, dense state). Heavy elements were produced later in stars, and the other choices are not key Big Bang evidence.