Scientists are grappling with a persistent mismatch in how fast the universe appears to be expanding, a problem known as the Hubble tension. New research explores whether faint magnetic fields from ...

In astronomy, where distances are too vast to measure with an ordinary ruler, geometry has long been the workhorse. Now, a new study has turned that ancient mathematical language into a precision tool ...

Cosmologists have an embarrassing problem: we don’t know what shape the universe is. The cosmos has three possible geometries—positively curved like a sphere, flat like an infinite plane or negatively ...