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Is dark energy really a mystery?

Nature volume 466, pages 321322 (15 July 2010) | Download Citation


The Universe is expanding. And the expansion seems to be speeding up. To account for that acceleration, a mysterious factor, 'dark energy', is often invoked. A contrary opinion — that this factor isn't at all mysterious — is here given voice, along with counter-arguments against that view.

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Author information


  1. Eugenio Bianchi and Carlo Rovelli are at the Centre de Physique Théorique de Luminy, Case 907, Luminy, Marseille F-13288, France.;

    • Eugenio Bianchi
    •  & Carlo Rovelli
  2. Rocky Kolb is in the Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637, USA.

    • Rocky Kolb


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