The actual matter density of the universe, accounting for all of the luminous matter and all of the dark matter known to exist i

Question

horsena [70]

3 years ago

11

The actual matter density of the universe, accounting for all of the luminous matter and all of the dark matter known to exist i

n galaxies and clusters, is what fraction of the critical density?

Social Studies

1 answer:

goldfiish [28.3K] · Answer 1 · 2022-02-24T21:53:59+03:00

Answer: The correct answer is : The critical density for the universe is approximately 10 ^ -26 kg / m ^ 3 or you can also say 10 hydrogen atoms per cubic meter.

Explanation: This value is given by:

critical density = 3H ^ 2/2 Pi G, where H is the Hubble constant and G is Newton's gravitational constant.

Critical density is the average density of matter necessary for the universe to stop its expansion but after an infinite time.