Question
Light from stars provides evidence that the universe is expanding.
How does light from stars indicate the universe is expanding?
A.
The light waves from the stars get "squished together."
B.
The light waves from the stars look bluer than they should.
C.
The light waves from the stars become "stretched out."
D.
The light waves from distant stars look white and small.
How does light from stars indicate the universe is expanding?
A.
The light waves from the stars get "squished together."
B.
The light waves from the stars look bluer than they should.
C.
The light waves from the stars become "stretched out."
D.
The light waves from distant stars look white and small.
Answers
GPT-4o mini
The correct answer is:
C. The light waves from the stars become "stretched out."
This phenomenon is known as redshift, which occurs when light from distant galaxies is shifted toward longer wavelengths (the red end of the spectrum) due to the expansion of the universe. As the universe expands, light from these distant objects is stretched, indicating that they are moving away from us.
C. The light waves from the stars become "stretched out."
This phenomenon is known as redshift, which occurs when light from distant galaxies is shifted toward longer wavelengths (the red end of the spectrum) due to the expansion of the universe. As the universe expands, light from these distant objects is stretched, indicating that they are moving away from us.