In a special illustrated feature, Ben Platts-Mills explains why Albert Einstein and other physicists refused to believe black holes could be real. Were they too strange to imagine?

By analyzing the velocity dispersion of the lensing galaxy, researchers estimate that dark matter constitutes about 11% of the mass within the Einstein radius of NGC 6505.

For most bodies, this co-called Schwarzschild radius would be deep beneath their surface; for the sun, for example, it would be located 1.9 miles (3 kilometers) from the heart of our star, which ...

University of California, Riverside, physicists solve a puzzle linked to JWST-ER1g, a massive ancient galaxy that formed when the universe was just a quarter of its current age.

The measurement of this effect during a solar eclipse in 1919 confirmed Einstein’s general theory of relativity: Mass warps spacetime and bends the path of light rays (SN: 10/17/15, p. 16).

An international team of scientists working with the Event Horizon Telescope project have been able to measure the radius of a black hole for the first time. It was in 1781 that astronomer Charles ...

Inspired by Einstein’s theory of general relativity and its novel vision of gravity, the German physicist Karl Schwarzschild took on this question in 1916.

Our final 68% errors from the combined network on the lensing parameters are 0.02″, 0.04, 0.04, 0.04″ and 0.04″ for the Einstein radius, the x and y components of ellipticity, and the x and ...

By analyzing the velocity dispersion of the lensing galaxy, researchers estimate that dark matter constitutes about 11% of the mass within the Einstein radius of NGC 6505.