Those stars are called brown dwarves.
Jupiter was going to become a star but when studied closely, scientists found that it was not massive enough to cause nuclear fusion in its core
Yes! As long as it is massive enough to form a spherical shape with it's own gravity, and not so massive that it becomes a star, and revolves around a star itself, it is considered a planet.
If a star is massive enough, after it produces a supernova it can either leave behind a neutron star or collapse into a black hole, depending on the mass of the original star.
A planet cannot become a star. A star is an object that is massive enough to release energy via nuclear fusion. A planet is much less massive.
A star is a luminous ball of plasma held together by its own gravity and produce energy through thermonuclear fusion. A planet is a body orbiting a star massive enough to be rounded by its own gravity but not massive enough to conduct fusion.
The answer depends on the original mass of the star. If it was not too massive, it will shrink to a dwarf star. If it was sufficiently massive, it will explode as a nova. A really massive star, exploding as a supernova, will leave behind either a neutron star, a pulsar or a black hole.
Saturn was not massive enough to initiate nuclear fusion.
No. it is not massive enough. When the sun dies it will become a white dwarf.
its not a massive or a dwarf star
A massive collapsed star is a dead star.
A Protostar doesn't really die. It is the early stage of star formation. If there is not enough mass you end up with a brown dwarf. If the mass is sufficient the next step is called a T Tauri star. The next phase would be a main-sequence star. Then depending on it's mass It will become a white dwarf or a red giant. If the red giant is massive enough the core collapse even more until the outer layers explode off, called a supernova. If the star was massive enough the core that is left behind will collapse into a neutron star or a black hole.
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