Astronomers have known about the expansion of the universe for nearly a hundred years. Twenty years ago, we set out to use exploding stars to measure gravity’s predicted effect: the slowing down of cosmic expansion. Amazingly, when we actually made the measurement, the expansion of the universe turned out to be speeding up! The astonishing (un)discovery of cosmic acceleration has now been confirmed from many directions. We attribute it to a “dark energy” that dominates the universe, whose nature is a deep mystery at the heart of physics.
Free and open to the public.
This event is part of The Undiscovered Science Lecture Series.