Physics is full of big, interesting questions about phenomenon such as black holes. This illustration shows the supermassive black hole at the heart of the active galaxy NGC 3783 in the southern constellation of Centaurus.
The Concorde was fast and changed how we thought about travel here on Earth. In the future, we may well travel at speeds that change our relationship with time itself.
David Parker/Getty Images
The Dark Sector Lab (DSL), located 3/4 of a mile from the Geographic South Pole, houses the BICEP2 telescope (left) and the South Pole Telescope (right).
Steffen Richter/Harvard University
Observing the multitude of galaxies in our own universe is a piece of cake. Observing the multiverse, if such a thing exists, seems impossible. Above, the Milky Way rises above the ESO's ALMA observatory in Chile.