Gravitational waves may be responsible for dark matter in the universe
Dark matter is thought to exist everywhere, wrapping around galaxies and helping to shape the largest things in…
2026 April – Caught in the Web
APOD: 2026 April – Caught in the Web Discover the cosmos! Each day a different image or photograph…
Astrophysicists are close to proving the existence of primordial black holes
On November 12, 2025, a ripple passed through the fabric of spacetime and triggered alarms at three gravitational-wave…
The physics of no return: What actually happens if you get pulled into a black hole
In 1916, only a year after Albert Einstein had published his general theory of relativity, Karl Schwarzschild used…
Gamma Cassiopeiae may be hiding a magnetic white dwarf companion
Visible without a telescope, γ Cassiopeiae has stood out for decades because it behaves unlike an ordinary massive…
APOD: 2026 March 26 – Black Holes and Neutron Stars: 218 Mergers and Counting
APOD: 2026 March 26 – Black Holes and Neutron Stars: 218 Mergers and Counting Discover the cosmos! Each…
Expanding catalog of black hole collisions is rewriting the history of the universe
Between May 2023 and January 2024, a global network of gravitational-wave detectors picked up 128 new cosmic signals,…
Astronomers discover the first neutron star–black hole merger with an eccentric orbit
In 2020, astronomers discovered a violent cosmic event that has led them to rethink how extreme pairs of…
Scientists find a new way to probe Neutron Star interiors
Neutron stars are like cosmic laboratories. Born from collapsed stars, they’re packed so tightly that a teaspoon of…
Astrophysicists Propose New Method to Measure Hubble Constant
Astrophysicists from the University of Illinois and the University of Chicago have developed an innovative method to measure…
Scientists develop a new way to measure the expansion rate of the universe
For years, cosmologists have argued over a simple question with an awkward answer: How fast is the universe…
Physicists propose a new way to spot supermassive black hole pairs
Supermassive black holes rarely travel alone. Most large galaxies hide one at the center, and when galaxies collide,…