Star questions.?

Question

1. Which group of stars are the most stable? Why?

2. Which group of stars represent most of the stars in space? Why?

I'm not sure but is number 2 the main sequence stars? but even if that was right, i need a explanation.

Answer 1

There are so many ways to "group" stars that I am not sure what kind of groups you are talking about.

If you decide to group stars as "Main sequence" versus "non-Main-sequence", then 1 and 2 call for "Main sequence".

Most stars spend their lives, happily fusing hydrogen on the main sequence. When they run out of hydrogen, they move off the main sequence and then things happen rapidly. Red Giant phase, Helium fusing, collapse or explosion (or both).

for 1, the exception would be for less massive stars who end up as dwarfs (and the dwarf phase can last as long as the main sequence phase).

But all in all, because main sequence is the longest part of life for most stars, then that is where there is a higher probability of finding a star chosen at random.

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I woudl tend to group stars as "more massive" and "less massive".

According to star formation theories, there are far more "less massive" stars formed than "more massive" ones.
Less massive stars spend more time on the main sequence (some stars much less massive than the sun, that were created when star formation began, are still on the main sequence -- that is how slowly they evolve). Less massive stars do not end their lives with a bang, they simply become dwarf stars and continue aging for billions of years.

More massive stars use up their fuel much faster, bloat out then blow up. Fast living, quick death.

Answer 2

cbirch, you need to do a little research. All stars are on the main sequence for some part of their lives. Many stars will move on to the red giant stage at some point in their lives as well, including our sun. They are indeed phases.

A main sequence star is one that is fusing hydrogen in its core. Red Dwarves (NOT red giants) are the longest-lived and most common stars in our universe. They are also the least luminous, and there are no red dwarves visible to the naked eye in the sky. They stay on the main sequence for a very long time because they do not consume their fuel very quickly. The smallest of them can last for trillions of years (which is a few orders of magnitude longer than the believed age of the universe).

When all but the smallest stars exhaust the hydrogen in its core, it will generally move on to fusing helium and bloating up to a very large size. This is the red giant phase. More massive stars can become absolutely enormous in this stage.

cbirch, before you start calling down other answerers claiming their information is wrong, you might want to make sure that is true. See my source for more information.

Answer 3

There are two main types of stars.
The first massive stars that coalesced out of the pristine hydrogen field.
They lived their lives and blew up in about ten million years.
The second type are the stars that formed after the super nova debris crashed into the edge of the hydrogen field that surrounded them.
Our sun and solar systems are one result.
The suns are classified as to there brightness and size,but they are a subset of the second type of stars.

Answer 4

well all stars are basically stable. but stars that last the longests are red giants, which are cooler stars. and um to the dude below me, STOP POSTING ABOUT THIS, ITS THE SECOND TIME IVE HEARD YOU MIS INFORM SOMEONE! red giant isnt a phase and neither is main sequence, they both refer to a type of star.

and i personally dont know what the majority of the stars in the universe are, but if i had to take a guess, which im going to, i would say that it is red giants. simply because they last the longest so theres a better chances of more of them being around.

your source is wikipedia. thats not a reliable source at all, anyone can post there.

Answer 5

1)
Red Dwarf stars are smaller than Blue Main Sequence stars, but they last millions, somtimes billions of year longer than Blue Main Sequence stars.

2)
Blue main sequence stars. BUT red dwarf stars are the most common kind, but since they are soo dull you cannot see them in the night sky, blue main sequence stars are 100,000 times more luminus than the sun.