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What forms when a main sequence star that has been contracting suddenly cools and expands?

A red giant forms when a main sequence star that has been contracting suddenly expands and cools.


What forms when a main sequence star that had been contracting suddenly expands and cools?

When a main sequence star that has been contracting suddenly expands and cools, it can transform into a red giant. This phase occurs as the star exhausts its hydrogen fuel in the core, leading to gravitational collapse and subsequent heating, which causes the outer layers to expand and cool. During this process, the star's outer envelope becomes much larger and redder, while the core may start fusing helium or heavier elements, depending on the star's mass. Eventually, the star may shed its outer layers, leading to the formation of a planetary nebula or, in more massive stars, a supernova.


Which is a star in its old age Protostar Main sequence Black Hole or Red giant?

A red giant is a star in its old age. During this stage, a star expands and cools as it exhausts its hydrogen fuel. Eventually, it will shed its outer layers, forming a planetary nebula.


What are the steps in the evolution of sun-like stars?

Birth: A sun-like star forms from a nebula of gas and dust. Main sequence: The star fuses hydrogen into helium at its core, balancing gravity with the outward pressure from nuclear fusion. Red giant: As the star exhausts its core hydrogen, it expands and cools, becoming a red giant. White dwarf: Eventually, the outer layers shed, leaving behind a hot, dense white dwarf core.


Is a red giant a main sequence star?

No, a red giant is a star that has just left the hydrogen burning main sequence and begun the next step, burning helium. As helium undergoes fusion at a much higher temperature than hydrogen undergoes fusion, the star expands dramatically and as it expands its outer layers cool to red heat.


How would you arrange this in order red giant white dwarf and main sequence?

The correct order of these stellar evolutionary stages is main sequence, red giant, white dwarf. A star begins its life on the main sequence where it fuses hydrogen into helium. As it runs out of fuel, it expands into a red giant before shedding its outer layers and collapsing into a white dwarf.


What is the phase that occurs after a main sequence star?

After its main sequence phase, a star like the Sun will enter the red giant phase where it expands and becomes cooler. Subsequently, it may evolve into a planetary nebula and eventually form a white dwarf.


What most stars are classified as?

Main Sequence


Where is the sun in its main sequence stage?

its to the right of the middle of the main sequence.


What are the two stars that are not in the main sequence?

There are billions of stars that are not on the main sequence.


What are the four stages in the life of an average star?

The life of an average star typically progresses through four stages: first, it forms from a collapsing cloud of gas and dust, becoming a protostar. Next, it enters the main sequence phase, where it fuses hydrogen into helium in its core, sustaining itself for billions of years. After exhausting its hydrogen, it expands into a red giant and begins fusing helium into heavier elements. Finally, the star sheds its outer layers, leaving behind a white dwarf that gradually cools and dims over time.


Do red main sequence stars have the highest surface temperature?

No. They have the lowest temperatures on the main sequence. The hottest main sequence stars are blue.