When a star is young, it spews intense radiation, which then heats up the area around the star. This heat is what causes the star to glow.
After a star is born from the nebula, it starts off as a protostar, then goes to a main sequence star, then a red giant, white dwarf, then black dwarf.
Gravity can create stars only if it can overcome the force of thermal pressure in a cloud. This collapse could be triggered by a galaxy collision, or the shockwave of a nearby supernova for example.
How long a main sequence star lives depends on how massive it is. A higher-mass star may have more material, but it burns through it faster due to higher core temperatures caused by greater gravitational forces. While the sun will spend about 10 billion years on the main sequence, a star 10 times as massive will stick around for only 20 million years. A red dwarf, which is half as massive as the sun, can last 80 to 100 billion years, which is far longer than the age of the universe.
The other 10% of stars are either in the star formation stage, and have not yet reached the main sequence, or are post-main sequence in the form of a dwarf star or red giant.
How does a molecular cloud collapse?
ReplyDeleteWhat are the stages of a stars life?
What makes a star shine?
When a star is young, it spews intense radiation, which then heats up the area around the star. This heat is what causes the star to glow.
DeleteAfter a star is born from the nebula, it starts off as a protostar, then goes to a main sequence star, then a red giant, white dwarf, then black dwarf.
Gravity can create stars only if it can overcome the force of thermal pressure in a cloud. This collapse could be triggered by a galaxy collision, or the shockwave of a nearby supernova for example.
How long are stars expected to be in the main sequence phase?
ReplyDeleteHow long a main sequence star lives depends on how massive it is. A higher-mass star may have more material, but it burns through it faster due to higher core temperatures caused by greater gravitational forces. While the sun will spend about 10 billion years on the main sequence, a star 10 times as massive will stick around for only 20 million years. A red dwarf, which is half as massive as the sun, can last 80 to 100 billion years, which is far longer than the age of the universe.
Deletewhat is a protostar?
ReplyDeletea protostar is a contracting mass of gas that represents an early stage in the formation of a star, before nucleosynthesis has begun.
DeleteWhat is the other 2% of Interstellar gas?
ReplyDeletetiny pieces of solid particles or dust (composed mainly of carbon, silicon and oxygen).
DeleteWhat is after Main sequence stars?
ReplyDeleteIt really depends on how massive the star is. It is likely that a main sequence Star will turn to a red or white dwarf.
DeleteA star remains on the main sequence as long as there is hydrogen in its core that it can fuse into helium.
DeleteIf 90% of stars are in the main sequence, where are the other 10% of stars?
ReplyDeleteIf a star is not in the main sequence phase that just means it is in a different stage of its life.
DeleteThe other 10% of stars are either in the star formation stage, and have not yet reached the main sequence, or are post-main sequence in the form of a dwarf star or red giant.
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