The Early Universe
A recent uptick in the discovery of the smallest, oldest galaxies benefits studies of dark matter, galaxy formation and the evolution of the universe.
Matter and antimatter behave differently. Scientists hope that investigating how might someday explain why we exist.
Theorists from the Institute for Advanced Study have proposed a way forward in the quest to test string theory.
Exploding stars have an immense capacity to destroy—and create.
How can we figure out when the universe began?