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Because it gets changed into helium by fusion.
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∙ 12y ago
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As the temperature of a star increases does the amount of light it emits increase or decrease?
It increases.
Why is the presence of large amount of helium in the spectrum of a star considered to be a sign of age?
Stars fuse hydrogen into helium, and then fuse the helium into carbon. For a star to have more than about 50% helium, we know that the star has already burned up half of its natural fuel, and that the end is near.
Why does the red yellow and blue stars differ in size and luminosity?
The temperature of the star and the amount of hydrogen and helium remaining
What is a middle age star?
yes, the sun is a middle age star. The age of the sun is found to be 5 billion years. this can be explained very easily. sun is a composition of hydrogen and helium . based on the amount of the hydrogen and the helium the age of the sun has been calculated.
Why would an older main sequence star composed of a higher percentage of helium than a young main-sequence star?
Im no astrophysicist but an older star would consume more of its hydrogen over time in comparison to helium through its fusion process. Over time concetrations would change resulting in a higher helium to hydrogen ratio.
Why does the amount of hydrogen in a star decrease?
Because Hydrogen is the fuel of Stars, hydrogen consumed and Helium is formed.
Why does a star's hydrogen supply run out?
The nuclear fusion in a star's core converts hydrogen into helium. Therefore the amount of hydrogen in a star is constantly decreasing.
As the temperature of a star increases does the amount of light it emits increase or decrease?
It increases.
The stars in the sky depend on what?
the amount of hydrogen left in their core. when the hydrogen starts to run out, the star will enlarge to a red giant due to the decrease of gravity pulling its surface in towards the core, and then the star will eat itself and become a white dwarf before eventually turning into a black dwarf (i think its called) and becoming virtually nothing.
What is in a star's core?
A star's core consists mostly of hydrogen. As the star ages, the amount of helium, carbon and other elements in the core increases as they are the result "ash" resulting from the consumption of the hydrogen fuel.
Why is the presence of large amount of helium in the spectrum of a star considered to be a sign of age?
Stars fuse hydrogen into helium, and then fuse the helium into carbon. For a star to have more than about 50% helium, we know that the star has already burned up half of its natural fuel, and that the end is near.
Why are there planets?
Planet exist because the amount of matter is not large enough or not made of superheated hydrogen to become a star.
What causes the sun to burn?
hydrogen is at the heart of a star, meaning that as it reacts it produces a massive amount of heat and light
what causes the sun burn?
hydrogen is at the heart of a star, meaning that as it reacts it produces a massive amount of heat and light
Why does the red yellow and blue stars differ in size and luminosity?
The temperature of the star and the amount of hydrogen and helium remaining
A star the size of your Sun continues its fusion for approximately 10 billion years until the supply of hydrogen runs out The amount of hydrogen required to keep up that process indicates that?
Hydrogen is extreamly abundant.
Why is an old main -sequence star have a higher percentage helium then a young main - sequence star?
Most stars - and specifically main-sequence stars - get their energy from converting hydrogen-1 to helium-4, so you would expect that the percentage of hydrogen will decrease over time, while the percentage of helium would increase over time. Please note that the rate of fusion depends a LOT on the mass of the star; so you might have a very massive star that's only a few million years old and has already burned up most of its fuel (hydrogen), and another star, a red dwarf, that's 10 billion years old and has only used a small percentage of its fuel.
