Question

question 13
1 pts
what evidence supports an acceleration in the expansion rate of the universe?
the discovery that type la supernova in distant galaxies are 25 percent fainter than
expected.
the discovery of super massive black holes at the center of quasars
the discovery of machos
the discovery of the grand unified theory
none of these choices

Explanation:

Type Ia supernovae are standard candles (consistent intrinsic brightness). Distant ones being fainter than expected means they are farther away than predicted by a decelerating or constant expansion model, implying the universe's expansion has accelerated over time. Other options are unrelated: supermassive black holes in quasars relate to galaxy evolution, MACHOs are dark matter candidates, and the grand unified theory is unproven and not evidence for acceleration.

Answer:

the discovery that type la supernova in distant galaxies are 25 percent fainter than expected.