Why Is It Not Possible to Look All the Way

question 44

Multiple Choice

Why is it not possible to look all the way back to the Big Bang itself?

• A)Photons are not produced until the stars begin to shine at a redshift of z ≈ 20.
• B)From redshifts of z = 0 to 100,photons are gravitationally lensed by the dark matter in the universe.
• C)At redshifts of z > 1,000,most of the photons are blocked by large amounts of cold gas and dust.
• D)For redshifts of z > 1,000,photons are heavily altered because they easily react with individual protons and electrons in the universe.
• E)Photons from the Big Bang would be so strongly redshifted that we could never detect them.

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