On the basis of recent results from very bright and very distant Type Ia supernovae,what seems to be our situation in the universe regarding the past and present motion of clusters of galaxies?
A) We live in a "flat" universe with a decelerating rate of expansion.
B) We live in an open universe with a constant rate of expansion given by the Hubble law.
C) We live in a closed universe with a decelerating rate of expansion.
D) We live in a "flat" universe with an accelerating rate of expansion.

Question

Quizplus · Accepted Answer

Recent results from Type Ia supernovae suggest that the expansion of the universe is accelerating, which indicates the existence of an unknown type of energy called dark energy. This implies that we live in a "flat" universe with an accelerating rate of expansion. The motion of clusters of galaxies in the past and present can also be explained by this model.

On the Basis of Recent Results from Very Bright and Very