Which is a reason that we know dark energy is a major componentof the universe?
a) The universe would not be 2.7 degrees Kelvin today without dark energy.
b) The gravity due to regular matter in the universe would have started it contractingagain by now without dark energy.
c) Supernovae would not occur without dark energy.
d) Dark energy is needed in order that light can escape from supermassive black holes.
e) The universe is flat and regular matter doesn't contribute enough energy density.
Ans: e) The universe is flat and regular matter doesn't contribute enough energy density.
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Fill in the blank(s) with correct word