The Puzzle of Dark Energy – Scientific American

  • Almost 20 years ago scientists discovered that the expansion of the universe is accelerating and dubbed the source of this acceleration “dark energy.”
  • Intensive investigations since then have not resolved the nature of dark energy but rather exposed a number of further questions: Why is dark energy so much weaker than theory seems to predict, what does it mean for the future of the cosmos, and might dark energy lead to the conclusion that we live in a multiverse?
  • With the advent of several recent and upcoming experiments, scientists hope that the coming years will finally bring some answers.

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