A simple experiment has detected a signal from the first stars forming just 180 million years after the Big Bang. The observations have intriguing implications for the nature of dark matter.
Results from the first data release of the Dark Energy Survey include eleven new stellar streams in the Milky Way galaxy.
Spacetime ripples from the neutron star smash-up usher in the age of multi-messenger astronomy.
Our galaxy's center region is producing gamma rays, but astronomers are still debating whether pulsars or dark matter are the source. Three recent studies tackle the debate head-on.
Hubble has spotted more than 100 small, faint galaxies in the young universe, common as dust bunnies but previously out of reach of even the best telescopes.
Observations of lensed quasars suggest the universe is expanding more quickly than we thought. But they contradict what we know about the young universe.