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A Brown Dwarf

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Q: If a protostar doesn't undergo a nuclear fusion what will it turn into?
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When does a protostar become a star?

The basic idea is that the protostar contracts, under the influence of gravity, until it gets dense and hot enough to undergo nuclear fusion. You can find more details at the Wikipedia article "Protostar".


Which substance is most likely to undergo nuclear fusion?

Hydrogen is the element that is most likely to undergo nuclear fusion.


When a protostar rises to 10000000 degrees celsius will a protostar become a star before or after nuclear fusion?

through the process of fusion, it becomes a star: the birth of the star is the start of fusion. therefore, it is after fusion that it is classified as a star.


Which type of star is NOT undergoing nuclear fusion?

A protostar; also a brown dwarf.


A protostar forms once the nebular cloud condenses and the core begins?

nuclear fusion


The onset of which event marks the change of a protostar into a star-?

The nuclear fusion of hydrogen into helium


The onset of which event marks the change of a protostar into a star?

the nuclear fusion of hydrogen into helium


What is the name of a young star that has not yet started nuclear fusion?

That sounds like the description of a protostar.


What is the difference between a brown dwarf and a protostar?

A protostar is a star the is developing as is on the way to starting nuclear fusion. A brown dwarf is a failed star, one that failed to gather enough mass to start fusion.


How hot must the core of a protostar be to begin nuclear fusion?

When the core of a protostar has reached about 10 million K, pressure within is so great that nuclear fusion of hydrogen begins, and a star is born.


Inside a prostar the nuclear fusion of hydrogen will begin when?

The core of the protostar reached an extremely high temperature


A protostar becomes a star when energy is released by the process of what?

Nuclear fusion. In the case of stars, it is often called nucleosynthesis.