A number of hypotheses have been used to explain how free oxygen first accumulated in Earth’s atmosphere some 2.4 billion years ago, but a full understanding has proven elusive. Now a new model offers ...

In August 2016, astronomers thrilled the world by announcing the discovery of a planet orbiting our nearest stellar neighbor, Proxima Centauri. This star — a mere 4.25 light-years away from Earth — is ...

Princeton’s vital research across the spectrum of environmental issues is today and will continue to be pivotal to solving some of humanity’s toughest problems. Our impact is built on a long, deep, ...