Big Black Holes Found in the Smallest Galaxies
Tiny, dim “dwarf” galaxies have been found to hide gas-spewing black holes.
Interstellar Visitor Found to Be Unlike a Comet or an Asteroid
The mystery of ’Oumuamua, the first interstellar object ever observed, continues to deepen.
The Young Milky Way Collided With a Dwarf Galaxy
Astronomers have found stars dating from a long-ago collision between the Milky Way and another galaxy. The crash helps to explain why the Milky Way looks the way it does.
A Radically Conservative Solution for Cosmology’s Biggest Mystery
Two ways of measuring the universe’s expansion rate yield two conflicting answers. Many point to the possibility of new physics at work, but a new analysis argues that unseen errors could be to blame.
Researchers Check Space-Time to See if It’s Made of Quantum Bits
The newly developed theory of emergent gravity, proposed as an alternative to dark matter, struggles in one of its first trials.