Brian Schmidt, an astrophysicist at Mount Stromlo, led an international group, the High-z Supernova Search Team, which looked at the rate of change of the Cosmic Expansion using type Ia supernovae. In 1998, the team discovered that cosmic expansion was accelerating, which was the opposite of the current theory. This universal acceleration means that dark energy must exist. The discovery was named the top science breakthrough of 1998 by "Science" magazine. In 2011, Brian Schmidt shared the Nobel Prize in Physics with Saul Perlmutter and Adam Riess for finding the evidence for the accelerating Universe.
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