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What percent of the stars are considered part of the main sequence?
Approximately 90% of stars are considered to be part of the main sequence. These are stars that are fusing hydrogen into helium in their cores, like our Sun. The main sequence is a stable period in a star's life cycle that can last for billions of years.
Do stars go through a long life cycle?
Low mass stars can last for hundreds of billions of years. Medium mass stars, like our sun will remain on the main sequence for roughly ten billion years. High mass stars, will last for millions of years. By any human measure, a million years is a long time.
Are the stars that you see at night really present when you see them?
Yes. There is a common myth that the stars you see at night have burnt out in the millions of years it takes for their light to reach us.This is not true for two reasons.The stars you see at night are in usually no more than a few hundred light years away, so you see them as they were, at most, a few hundred years ago.Most stars last for billions of years, so a period of a few million years, let alone a few hundred, is not significant.
How much did the hundred years last?
116 years
How much years can honey last?
a hundred years
What is the name of the state that stars spend the majority of their life span in?
Stars spend the majority of their life span in the main sequence phase, which is a stable period of nuclear fusion where they convert hydrogen into helium. This phase can last for billions of years for stars like the sun.
How long did the Hundred Years War last?
The Hundred Years War lasted for 116 years, from 1337 to 1453.
Most stars are what kind of stars?
Most stars in the universe are main sequence stars. These stars are in a stable phase of their life cycle where they generate energy through nuclear fusion in their cores. The Sun is a main sequence star.
Can stars shine for billions of years?
Yes. Most stars do. Our own star, the sun, is about 4.6 billion years old and is expected to last for about another 5 billion years. The smallest, slowest-burning stars are believed to be able to last for trillions of years. Giant stars, which burn quickly, may only last a few million years.
How long do main sequence stars live?
A main sequence star is a star that is fusing hydrogen in its core. Stars leave the main sequence when they run out of hydrogen and start to fuse heavier elements (starting with helium and finishing with iron). The length of time a star remains on the main sequence depends on how massive the star is. The larger the star the more gravity it has and the tighter this gravity squeezes the core - this makes the core hotter and brings the hydrogen atoms closer together so the fusion process proceeds more rapidly. Thus big stars will only spend a few tens of millions of years on the main sequence while stars the size of our sun will spend ten thousand million years on the main sequence, and smaller stars (red dwarf stars) will spend trillions of years fusing hydrogen.
Is it possible that the starlight you see in the night sky is from a star that no longer exists?
It is possible but highly unlikely. The stars you see in the sky are light years from Earth, meaning the light takes years to reach us and so we see the stars as they were years ago. For example, if a star is 50 light years away we see it as it was 50 years ago. The nearest star in the nigh sky is just over 4 light years away and most of the ones we see are within a few hundred light years. A few hundred years is insignificant in the life cycle of a star. Even the shortest-lived stars last for millions of years and most last for billions.
If The light you see from the North Star was emitted in 1583 and takes 430 light years to get to earth does that mean it should be burning out soon?
No. A few hundred years is insignificant in the lifetime of a star. Even the shortest-live stars last for millions of years. Polaris is a three star system. The main star, Polaris A will probably last for another few tens of millions of years while the other tow stars will last for another few billion years.
