A supernova is the catastrophic death of a star, characterized by a massive output of energy.
we all die
It is yes
If it's a big enough explosion it will become a supernova
It's gamma rays will have traveled one light year.
A supernova occurs.
A supernova occurs.
Mass decides a stars ultimate fate.
big explosion :O the sun is too small a star for a supernova.
A supernova happens when most of the core of the collapsing star has become neutrons, held up against gravity by neutron degeneracy pressure. At this point a shockwave reflects from the neutron star surface, driving the supernova explosion.So the answer to your question is neutrons.
The heavy elements are formed when a supernova explodes. That happens quite frequently, when a star suddenly increases in brightness by a huge amount for a few months. If a supernova is close to us it can be seen as a new star, and that happens about twice in 1000 years.
Bad things. If all the starts went supernova at the exact same time, we'd still only be affected by our own sun's supernova. The others starts are so far away that we wouldn't notice for years. Assuming that the sun somehow skipped the other stages of death and suddenly went supernova regardless of its mass, we'd be doomed about 8 minutes after it happens. On the scale of the universe though, there'd be complete chaos. Planets flying everywhere, no more energy for known life to exist, etc. Keep in mind that only the largest of starts can potentially go supernova, though. If only the starts big and bright enough to supernova went supernova, things would be bad but very different.
It becomes a Type Ia supernova [See Link]