A completely dark, invisible object weighing 1 million times the mass of the Sun has been detected through its gravitational influence alone, without emitting any light. Hidden within a distant galaxy ...

A new theoretical proposal argues that the massive object sitting at the center of our galaxy may not be a black hole at all, but rather a dense clump of fermionic dark matter with no event horizon.

Add Yahoo as a preferred source to see more of our stories on Google. Researchers tried to figure out whether asteroid 16 Psyche, which NASA is visiting in 2029, is the remnant of a planet's core.