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galaxies

astrophysics

Astronomers Creep Up to the Edge of the Milky Way’s Black Hole

Hot spots have been discovered orbiting just outside the supermassive black hole at the galaxy’s center. Their motions have given us the closest look at that violent environment.

Illustration of a galaxy simulation.
cosmology

The Universe Is Not a Simulation, but We Can Now Simulate It

Computer simulations have become so accurate that cosmologists can now use them to study dark matter, supermassive black holes and other mysteries of the real evolving cosmos.

Andrea Ghez in Hawaii
Q&A

Black-Hole Hunter Takes Aim at Einstein

The astrophysicist Andrea Ghez spent two decades proving that a supermassive black hole anchors the center of the Milky Way galaxy. Her new plan? Test what happens when things get too close.

Andromeda galaxy
Abstractions blog

How Superfluid Dark Matter Mimics an Old Idea About Gravity

Does the force of gravity change at large scales? Perhaps not, but a new theory of dark matter shows why that could appear to be the case.