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70 percent

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  • How much of the universe is dark matter and energy?

  • By fitting a theoretical model of the composition of the universe to the combined set of cosmological observations, scientists have come up with the composition that we described above, ~68% dark energy, ~27% dark matter, ~5% normal matter. What is dark matter? We are much more certain what dark matter is not than we are what it is.

  • How do we know how much dark energy there is?

  • We know how much dark energy there is because we know how it affects the universe’s expansion. Other than that, it is a complete mystery. But it is an important mystery. It turns out that roughly 68% of the universe is dark energy.

  • What percentage of the universe is made of atoms and light?

  • All the atoms and light in the universe together make up less than five percent of the total contents of the cosmos. The rest is composed of dark matter and dark energy, which are invisible but dominate the structure and evolution of the universe.

  • How does dark energy affect the acceleration of the universe?

  • In a Universe with dark energy as well as dark matter, the initial deceleration is reversed at late times by the increasing dominance of dark energy. If the hypothetical dark energy continues to dominate the Universe’s energy balance, then the current expansion of space will continue to accelerate, exponentially.

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