Neutron stars have a radius on the order of 10 kilometres (6.2 mi) and a mass of about 1.4 solar masses.

In an unprecedented astronomical discovery, two neutron stars were seen colliding for the first time. ... There’s a possibility that when neutron stars collide, not everything gets swallowed up into a more massive neutron star or black hole, but instead some fraction gets flung out and forms these heavy nuclei. NSF / LIGO / Sonoma State University / A. Simonnet. Prior observations indicate that the neutron stars were 1.1 to 1.6 solar masses each, which meant they spiraled in slower than a massive pair such as black holes, allowing for a longer merger time to be recorded (Timmer 2017, Moskovitch, Wright).

01/24/17. Five extreme facts about neutron stars. The collision created gravitational waves, light and heavy elements like gold and platinum. Scientists Hunt Neutron Star-Black Hole Collision. Two Neutron Stars Once Exploded in Our Backyard. By Ali Sundermier. When neutron stars collide graphic. A new observation may show such events produce heavy elements like gold. A neutron star is the collapsed core of a giant star, which before collapse had a total mass of between 10 and 29 solar masses.Neutron stars are the smallest and densest stars, excluding black holes and hypothetical white holes, quark stars, and strange stars.

When Neutron Stars Collide Artist’s illustration of the merger of two neutron stars, which produced a brief burst of gamma.

Neutron stars are the smallest, densest stars known to exist: about 12 miles wide, with a teaspoon of neutron star material having a …

Such an event is the likely cause of short-duration gamma-ray bursts. Artist's impression of two neutron stars colliding. The Laser Interferometer Gravitational-wave Observatory (LIGO) detectors witnessed spacetime ripples coming from two colliding neutron stars on August 17, 2017.