Cosmology: If the density of the universe is less than the critical density, then the total energy of the universe is
A) positive.
B) negative.
C) zero.

Question

Quizplus · Accepted Answer

If the density of the universe is less than the critical density, then the universe is said to be "open" and its total energy is positive. This means that the amount of matter and energy in the universe is not enough to stop its expansion and it will continue to expand forever. As the universe expands, it will become less dense and less energetic.

Cosmology: If the Density of the Universe Is Less Than