The bold question-askers at What If warn how a black neutron star could destabilize Earth’s orbit and wreak havoc.

The precursors of heavy elements might arise in the plasma underbellies of swollen stars or in smoldering stellar corpses.

See a pair of superheavy neutron stars collide in this simulation with gravitational wave audio. "An audible tone and a visual frequency scale (at left) track the steady rise in the frequency of ...

Imagine a star so dense that a teaspoon of its material would weigh as much as Mount Everest, spinning hundreds of times per ...

Astronomers from the University of Turku in Finland and elsewhere have performed a broadband spectral and timing study of an ...

Scientists say that the construction of a vast new radio telescope array in the Utah desert — known as the Deep Synoptic ...

I’ve spent much of my long life studying — and trying to understand — the history of the universe. Along the way, I have been constantly reminded that science is essentially international: Science ...

A team of scientists is proposing a bold alternative to the Big Bang theory, suggesting that our universe may have instead ...

The explosion of a star, called a supernova, is an immensely violent event. It usually involves a star more than eight times ...

NASA's NICER (Neutron star Interior Composition Explorer), an X-ray telescope on the International Space Station, has paused ...

The universe has two kinds of matter. There is invisible dark matter, known only because of its gravitational effects on a ...

A cataclysmic variable star was found as part of a project using two telescopes from opposite sides of the world.