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Newly discovered “standard sirens” provide an independent, clean way to measure how fast the universe is expanding.
The first major results from the Dark Energy Survey signal the start of a new era of cosmology.
Astronomers thought that all Type Ia supernovas shine with the same brightness, making them incredibly useful cosmic yardsticks. But uncertainty over what causes these explosions has led researchers to reconsider their assumptions.
Daily bike rides, serendipitous interactions and long periods of solo thinking inspire this string cosmologist.
The newly developed theory of emergent gravity, proposed as an alternative to dark matter, struggles in one of its first trials.
A different kind of dark matter could help to resolve an old celestial conundrum.
A series of observations at the very edge of the universe has reignited a debate over what lifted the primordial cosmic fog.
After a surprise discovery, astrophysicists are racing to understand superenergetic flashes of radio waves that sometimes beep out from distant galaxies.
A proposed theory of gravity does away with dark matter, even as new astrophysical findings challenge the need for galaxies full of the invisible mystery particles.