Originally Posted by catsmoke
depends when happen dont it
im am kiding
thx you very much
I'll respond even though you are kidding. If it was X amount of light years away, it also happened X amount of years ago.
and for those who don't follow this like a hobby as I do.. here is the TL,DR:
Neutron stars are essentially very dense dying stars that are just too dense to die. Normally a star dies because it runs out of the energy it need for its mass to not implode in on itself. Usually when it implodes, there is a lot of material ejected and something that remains as a dense core or smaller star. Think of a star almost like a dense burning cloud that, when it runs out of fuel, that cloud implodes on itself and get very dense. Depending on how much mass the star has a few things will happen;
(Keep in mind that the more massive a star, the more energy it has and therefore larger stars burn out and die much faster than smaller stars.)
it will become a white dwarf - this is most common and happens to stars like our sun, which are the most common type of star. White dwarfs are small and take a very long time to burn out completely. Per the age of the universe as we know it, no white dwarfs could have possibly burned out yet.
it will become a nova/supernova - larger stars have enough mass to explode and form gas clouds that smaller stars like ours can form in. These are usually know as nebulas. A smaller star of varying size will be left as the core remains of the super nova. The "crab shell nebula" is a good example of this as you can clearly see the smaller star/star core that still exists in the center of the nebula.
It will become a neutron star - these are star that are so dense that even when they run out of fuel, they have enough mass to compress the atoms in its core so much that protons and neutrons are compressed into the same space and physics get pretty weird. Neuron stars are in a place where we know a bit about how the physics start to break down before it becomes a black hole and we can't know anything about it beyond it's gravitational effects on other stars, so they are pretty interesting to astrophysicists.
It will become a black hole - this happens when a star is so massive that, without the energy needed to keep it in a active and less dense form, it collapses in on itself so much that it forms a gravity well that curves space infinitely, meaning light curves into it so no information from within can ever escape.
Neutron stars are very dense and they emit bright light at their poles. They also rotate very fast so we tend to find neutron stars when their poles point at us because we can see the pulsing light as a repeating flicker and we call these pulsars. Essentially, pulsars are neutron stars that we can see because they happen to point in the right direction.
Seeing one of these torn apart in a black hole could allow astrophysicists to gain insight into the makings of a neutron star, where physics gets very weird, if they can observe the light spectrum from it. From there they can determine what elements are present among other thing.