Every star, every pebble, every galaxy, every person, the oceans and the moon, the hundreds of billions of galaxies—every thing anyone anywhere has ever seen or will ever see in sum total amounts to less than 5% of the composition of the universe. Overwhelmingly, the universe is dominated by a form of invisible energy that permeates space—dark energy. We cannot see the energy although we live in an all-pervasive invisible dark sea. We do not know its origin or what it’s made of, if it will last forever, or evaporate in some far future. Though invisible, its dark presence is inferred as the unexpected source powering the ever-faster expansion of our universe. Dominant and everywhere, dark energy might be no more than the energy of nothing, an inescapable energy of empty spacetime.Director of Sciences Janna Levin invites cosmologist Pedro Ferreira and theoretical physicist Rachel Rosen to consider the most pressing question facing cosmology: What is dark energy?
This project is supported by the Alfred P. Sloan Foundation Program in Public Understanding of Science and Technology, bridging the two cultures of science and the arts.
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