If the neutron stars are larger than 2.5 times the mass of the Sun, you get a different scenario: there will be what's called a neutron star remnant. Bursting with neutrons — Neutron stars collide, solve major astronomical mysteries Produces light and gravitational waves, confirms collisions produce fast gamma ray bursts, heavy elements. In fact, scientist predict that from all start in our galaxy, we have about one collision every 10,000 years.

The fun starts if two neutron stars collide (which happens more often than you think), or a neutron star passes inside the Roche limit of a black hole or larger neutron star (this also happens more often than you think). This artist’s conception portrays two neutron stars at the moment of collision.

No GRB is likely to take place. A neutron star is so dense that one teaspoon (5 milliliters) of its material would have a mass over 5.5 × 10 12 kg, about 900 times the mass of the Great Pyramid of Giza. What does happen more often is that 2 (or even more) stars get so close together that they start orbiting each other. If a black hole emerges from the collision, then it will be signaled by a gamma-ray burst. No, they’re basically just one big ball of neutron soup, being held together by gravity. The neutron star's density varies from about 1 × 10 9 kg/m 3 in the crust—increasing with depth—to about 6 × 10 17 or 8 × 10 17 kg/m 3 (denser than an atomic nucleus) deeper inside. Credit: Dana Berry, SkyWorks Digital, Inc. We have had lots of ideas about them and their relationship to the known Universe, but simulations only take you so far. Stars collide, and scientists — for the first time — could see and ‘hear’ it
By Eric Moskowitz Globe Staff, October 16, 2017, 10:00 a.m. Email to a Friend All Earth’s gold likely came from colliding neutron stars. Let the good times roll. So, for right now, the conclusion is that you will either get a neutron star remnant or a black hole. Two neutron stars violently collide—potentially the sourse of all heavy elements in the universe, including gold. So, for right now, the conclusion is that you will either get a neutron star remnant or a black hole. That’s why 2017 was an important year, for after all the frustrating null results, a neutron star collision was finally spotted. New observations confirm that colliding neutron stars produce short gamma-ray bursts.
If the neutron stars are larger than 2.5 times the mass of the Sun, you get a different scenario: there will be what's called a neutron star remnant. Do neutron stars make elements from their intense density? If a black hole emerges from the collision, then it will be signaled by a gamma-ray burst. Not really that often. Such collisions produce rare heavy elements, including gold. No GRB is likely to take place. And, of course, some of these starts still have planets orbiting them.