Why Does the Observable Universe Have an "Edge

question 149

Multiple Choice

Why does the observable universe have an "edge"?

• A) Astronomers cannot see any farther out into space than the distance that light has traveled over the lifetime of the universe.
• B) The density of neutrinos at the "edge" becomes so large that photons cannot penetrate this barrier, and this prevents observers from seeing beyond this point.
• C) Absorbing matter prevents observers from seeing beyond a certain distance.
• D) There are so many galaxies in the universe that every line of sight eventually hits a galaxy, stopping observers from seeing any farther.

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