Astronomy Stack Exchange
Astronomy Stack Exchange

Questions tagged [dark-energy]

Questions regarding the as-yet-unknown energy permeating the universe that is responsible for its expansion.

Dark energy is the mysterious cause of the acceleration expansion of the universe. It makes up around three quarters of the total mass and energy of the universe, yet its properties and fundamental nature are unknown. Not to be confused with dark matter.

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why do we look at dark energy as an energy?

We call dark matter dark matter, because of the way it acts on galaxies, but why do we look at dark energy as an energy? With $E = m c^2$, can't dark energy be mass as well? Why dont we look at dark energy as a mass, in the same way as we look at…
usethedeathstar
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Is the dark energy between the moon and Earth measurable in any capacity?

What are the experiments, or measurements, that can detect, or account for, dark energy involved in making calculations concerning Earth and its only natural satellite?
Billy
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Why is dark energy density given in grams per cm$^3?$

According to Wikipedia article, The density of dark energy ($~ 7 × 10^{−30} g/cm^3$) is very low, much less than the density of ordinary matter or dark matter within galaxies. However, it comes to dominate the mass–energy of the universe because it…
SF.
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Relationship between the Casimir force and dark energy

This is related to another question I asked. Might we actually be observing dark energy when we do experiments that verify the Casimir effect?
Jack R. Woods
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What is the distribution of dark energy?

Dark matter is not distributed evenly. It forms clouds, it concentrates in galaxies, it forms hairs around celestial bodies. A google search for dark energy distribution floods me with dark matter distribution results. How is dark energy…
SF.
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Why isn't the dark energy getting decreased?

AS the articles on the web suggest, Dark energy is the reason behind the expansion of universe. If so, why isn't it getting used up in doing so. And consequently, the rate of expansion should reduce!
Spacetrekker
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Are virtual particles the dark energy that curves spacetime negatively?

Dark energy is said to be the cause of the accelerated expansion that all galaxies in the universe seem to have wrt each other. This is said to be caused by an accelerated expansion of space itself, but it can also be viewed as an accelerated motion…
Deschele Schilder
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In what form was dark energy stored 6 billion years ago?

Bearing in mind the provisions of the 1st Law of Thermodynamics, which decrees that energy can neither be created nor destroyed, all the energy in the Universe must have been there at the time of the Big Bang. Dark energy began to accelerate the…
Michael Walsby
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