The expansion of the universe seems to be accelerating. The evidence for this is based on observations of
A) the cosmic background radiation.
B) gas clouds orbiting the centers of galaxies.
C) the slowing down in the pulsation rate of distant neutron stars.
D) the redshift in the light from the explosions of distant supernovas.
E) the manner in which the stars are distributed in our own galaxy.

Question

Quizplus · Accepted Answer

The acceleration of the universe's expansion is evidenced by the redshift observed in the light from distant supernova explosions, specifically Type Ia supernovae, which act as standard candles for measuring cosmic distances.

The Expansion of the Universe Seems to Be Accelerating