Question

If some unknown cause of red shift—such as light becoming "tired" from traveling long distances through empty space—is discovered, what effect would there be on cosmology?

a) It would challenge the concept of the expanding universe
b) It would support the existence of dark matter
c) It would confirm the steady-state model of the universe
d) It would have no impact on current cosmological models

Answer 1

If an unknown cause of red shift, such as light becoming "tired" from traveling long distances through empty space, is discovered, it would challenge the concept of the expanding universe.

Step-by-step explanation:

If some unknown cause of red shift—such as light becoming "tired" from traveling long distances through empty space—is discovered, it would challenge the concept of the expanding universe.

The red shift of light from distant galaxies is currently interpreted as evidence that the universe is expanding.

If an alternative explanation for red shift is found, it could potentially undermine the current understanding of cosmology and the Big Bang theory.