Do all stars nova??

Question

I know they all die eventually, but is it always by a nova/supernova when they do?

Answer 1

Nope, most will expand and then become a huge bunch of gas that'll form a nebula.

Answer 2

no.

All stars begin as vast accumulations of hydrogen gas which condenses because of gravity. The gas gets denser and hotter and at some point, fusion begins. This generates enormous amounts of energy which counter balances the inward crush of gravity. The star lives out its life balanced between the inward force of gravity and the outward force of nucleur fusion.

Stars fuse Hydrogen into Helium and then Carbon and finally Iron. As the amount of Hydrogen is exhausted, the fusion of heavier elements generates even more energy. This dominates the forces inside the star and it begins to expand like a hot air baloon. This phase of the star's life is known as the "red giant" phase.

Ordinary fusion can not fuse any element denser than iron. As the amount of useable material is exhausted, the star begins to contract as gravity dominates once again. How fast the contraction ocurrs determines the fate of the star.

Massive stars larger than the sun can collapse very quickly. This enormous increase in density suddenly begins to fuse iron, and this releases a corresponding shock wave as Iron fuses into things such as Gold, Lead and even Xenon. The sudden increase in energy released can then destroy the star completely. This is known as a "Nova." It leaves behind a enormous cloud of debris known as a nebula. If this material encounters another regoin rich in lighter elements like Hydrogen and Helium, a new star can form, and even solid planets, since the nebula material was enriched with solid elements like silicon, carbon and iron. This was how our own solar system formed.

Sometimes the collapsing star is so massive, gravity dominates it entirely and it forms what is known as a "black hole". These objects are so massive even light can't escape them. Their gravity can even bend light, forming what is known as a "gravitational lens". These lenses are a good indication a black hole is somewhere in the area. It is know thought that most galaxies have a super massive black hole in their center. It might have been a series of smaller black holes which merged. Although light can't escape their surface, black holes do radiate a form of energy known as "Hawkings radiation". because of this, the black hole will eventually turn all its mass into pure energy and actually evaporate, but this will take a long time.

Stars like our sun usually collapse into what is known as a "neutron star". The sun will retain its mass but condense to the size of the earth. Its gravity will be the same, and material from its surface will be mostly iron and carbon and weigh about a ton per teaspoon.

Stars smaller than our sun can become "white dwarves". These retain enough fusable material to continue to shine brightly even after gravity has dominated them. The rate of stellar fusion is dependant on the initial size of a star. Very large stars fuse very quickly and have short lives, sometimes only 100 million years. Smaller stars can last 10 billion years and there are some stars just smaller than the sun which will continue to shine long after ours has become a neutron star.

All the matter in the universe will probably become energy in the form of radio waves. The wavelength will continue to increase until it is infinite. At this point, nothing will exist. What is driving this process is something known as "entropy".

Answer 3

No.

The initial mass of the star determines if it will nova or just consume itself over time.

But not all stars "die eventually" either. Some have sufficient mass that they collapse into a *Black Hole* that continues to consume matter forever as time has essentially slowed to almost zero for them relatively speaking.

Answer 4

I thought you were talking about Brittney there for a moment.

In any case, no. Our sun is expected to just expand into a red giant and then slowly shrink as the fusion fuel is used up.

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Answer 5

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Answer 6

Not always. Some simply burn out quietly. Many cosmic anomalies happen.

Answer 7

There is nothing more that I can add to the superb answers already given.thank you for tthe question.