Dark Energy Hunter: 7 Questions for Nobel Prize Winner Saul Perlmutter
Dark energy is still mystifying, even to those that first discovered it.
Saul Perlmutter, an astrophysicist at Lawrence Berkeley National Laboratory in California, won the 2011 Nobel Prize in physics for helping reveal that the expansion of the universe was accelerating (he shared the prize with Brian Schmidt of the Australian National University and Adam Riess of the Space Telescope Science Institute).
Whatever is causing this acceleration has been dubbed dark energy, a name that speaks plainly of its continuing mysteriousness. SPACE.com caught up with Perlmutter at the 221st meeting of the American Astronomical Society in January in Long Beach, Calif., where the scientist shared his latest thinking on the murky entity he helped discover.