the universe is infinite in extent and will expand forever.
On the basis of our current best estimate of the present mass density of the universe, astronomers think that the universe is infinite in extent and will expand forever.
<h3>What is the foundation for the proof that the cosmos is free to expansion?</h3>
The includes as evidence for the big bang.
1) The universe is expanding, as observed.
2) Independent proof of the omnipresent nature of microwave radiation throughout space.
3) The universe has an average temperature of 2.7 Kelvin.
<h3>Why is it so challenging to calculate the density of the universe?</h3>
- It denotes that the universe is "closed" and that its density exceeds the critical density.
- There is a lot of matter in the universe that does not emit much (or any) light.
<h3>What is true of the majority of the universe's mass?</h3>
- Around 27% of the universe's mass is made up of dark matter, compared to 5% made up of regular matter (protons, neutrons, electrons, neutrinos, etc.); dark matter is about 6 times more prevalent.
- The remaining 68% of the universe's total mass and energy is known as "dark energy."
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