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How can the total mass of the universe be calculatedwhen they don't know what dark energy is or if it has mass

dark energy approx. 75 of known universe

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They can estimate mass based on an objects size, distance, and by how much light is bent by gravity. Finding an average of mass contained in an average volume allows for an estimate. Dark energy is not considered in this estimate because it is only responsible for the acceleration of the expansion of the universe. It works against gravity in spreading out mass, so we can assume it doesn't contribute to mass in anyway.

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As mass and energy are equivalent surely it follows that dark energy must possess mass
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For the four known forces, energy has an equivalence to mass, but they don't know what dark energy is or why it is increasing in quantity. It works against gravity and mass so in this case mass and dark energy equivalence does not apply.
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Well, duh, the obviously can't. Astronomers have made a guess of the size of the universe, and that means that the mass is guessed. For all we know, the universe is infinite. It's impossible to know the size or mass.

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thank you.Do you think think the answers will be found in quantum theory
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It's not calculated ... it's estimated, based on what they do know.

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Frankly, I don't know. And so does nobody else yet. We are still working hard to chart what we see as "the universe", and only 1% or so is covered so far. There are to many unknown factors still to make statements about the mass or size, and a number of other things. The real science elite in that field don't deny that. But if people want to make calculations - paper is patient.

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thank you for your reply.i think things are becoming so complicated we will have to evolve a higher level of intelligence in order to understand these mysteries David
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It's 73% and we don't know because 1) higher dimension and 2) it's there can't touch feel it etc? but dark matter is 21% it's has no mass but gravity weird isn't it and you can calculate the mass but you have do exponential numbers in thousands for stars planets galaxies and asteroids every atom of dust nebulas etc?

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I read aquote somewhere that we may not br ablr to solve these mysteries but we may be incapable of understanding.Surely there must be super intelligences who have solved these problems but why the deafenihg silence
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Problem is 1) you can't go to higher only lower 2) the human cannot think of a higher night look like you can't 3) black holes can't hold galaxies together therefore a more powerful source dies thus black matter
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Oops wrong question you can calculate the mass it's gonna be an addition problem 3 parsecs long
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