Neutron star and black hole masses in binary systems are calculable using Kepler's laws of motion, based on orbital parameters and object speeds. Merging neutron stars or black holes emit ...

Dark matter is an enigmatic form of matter not expected to emit light, yet it is essential to understanding how the rich tapestry of stars and galaxies we see in the night sky evolved. As a ...

Astronomers have found that a planet discovered earlier this year is, in many ways, Earth’s twin. It’s the smallest exoplanets yet found for which we’ve been able to measure both its size and density.