On the basis of recent results from very bright and very distant Type Ia supernovae, which of these statements BEST characterizes the past and present motion of clusters of galaxies?
A) The universe is "flat," with a decelerating rate of expansion.
B) The universe is "open," with a constant rate of expansion given by the Hubble law.
C) The universe is "closed," with a decelerating rate of expansion.
D) The universe is "flat," with an accelerating rate of expansion.

Question

Quizplus · Accepted Answer

Recent observations of Type Ia supernovae indicate that the universe is "flat" and its expansion is accelerating, contrary to previous theories that suggested a decelerating expansion.

On the Basis of Recent Results from Very Bright and Very