Not my department, but kudos to the home boy. 
His work and the two he shared the prize with showed that the universe was expanding at an increasing rate, leading to the hypothesis that there was "dark energy" driving the expansion.
Astrophysicist Adam Riess shares Nobel Prize in Physics | Johns Hopkins University |

His work and the two he shared the prize with showed that the universe was expanding at an increasing rate, leading to the hypothesis that there was "dark energy" driving the expansion.
Astrophysicist Adam Riess shares Nobel Prize in Physics | Johns Hopkins University |