Question

If there is so much missing mass, why is the expansion of universe still accelerating ?

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Answer 1

Answer:

• So a universe that just expands at a constant rate is actually just as strange as one that accelerates. You still have to explain why the expansion doesn't slow down due to the gravity of everything it contains. ... The solution might be acceleration, or a new theory of gravity.Explanation:
• Mark as branily

Answer 2

Answer:

This expansion rate, a speed-per-unit-distance, changes over time, dependent on the amount of energy present within a given volume of the Universe. As the Universe expands, the amount of dark energy in a given volume stays the same, but the matter and energy densities go down, and therefore so does the expansion rate.

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