Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology. Different techniques for measuring the Hubble constant stubbornly disagree ...

A San Diego high school senior is a finalist in the prestigious Regeneron Science Talent Search competition for her research ...

Astronomers have spotted what may be one of the universe’s earliest barred spiral galaxies — a striking cosmic structure forming just 2 billion years after the Big Bang. The galaxy, COSMOS-74706, ...

The “horizon” he points to isn’t a doorway to the divine, other scientists say. Yet, modern physics has been trying to answer questions once left to religion.

In 1974, physicist Stephen Hawking described the potential for tiny, primordial black holes that existed at the dawn of time to explode — and reshaped what we knew about these cosmic behemoths.

This enormous chain of hundreds of galaxies—a cosmic filament—is twisting through space 400 million light-years away ...

NASA's Mike Fincke has identified himself as the astronaut whose medical condition prompted the space agency's first medical ...

Using the James Webb Space Telescope, astronomers have investigated 70 dusty galaxies at the very edge of the universe that ...

Musk’s vision for cities on the moon and Mars is an attempt to make science fiction a reality.

An astrophysicist explains what wormholes are and how these theoretical space-time tunnels have popped up in the solutions to a set of decadesold equations.

"This is a crucial step towards characterizing giant planets beyond our solar system." ...

A dense network of sensors is looking for the fleeting footprints of neutrinos, the most mysterious in the pantheon of known particles.