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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.

  • What is the nature of dark energy?

  • The remaining portion of the universe consists of ordinary matter and dark matter. Dark energy, in contrast to both forms of matter, is relatively uniform in time and space and is gravitationally repulsive, not attractive, within the volume it occupies. The nature of dark energy is still not well understood.

  • 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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