0
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.
What else can I help you with?
What percentage of stars are main sequence stars?
Approximately 90% of stars in the universe are categorized as main sequence stars. These stars, like our Sun, are in the stable phase of their lifecycle where they fuse hydrogen into helium in their cores. Main sequence stars vary in size and temperature, leading to differences in brightness and color.
Why would an old main sequence star have more helium?
Stars make Helium as they shine - so more with age.
What is a medium size yellow star composed mostly of hydrogen and helium?
All stars are composed mostly of hydrogen. The star fuses hydrogen into helium. The helium cannot escape the start until the end of the star's life cycle. Thus a middle-aged, medium sized star will be comprised of hydrogen and helium. As the star ages, it may start to fuse helium at its core into carbon. At this point it will likely expand into a red giant star, and thus would no longer be yellow.
What percentage of helium is in the sun?
Helium makes up about 24% of the sun's mass.
Is the sun a planet a star or comet?
The sun is a star. It is a massive ball of gas primarily composed of hydrogen and helium that emits light and heat through nuclear fusion at its core.
What old-main-sequence star will be composed of a higher percentage of helium than a young main-sequene star?
All of them, that's how a star gets to be "old" ... it converts its hydrogen into helium.
Why would an older main sequense star be composed of a higher percentage of helium than a young main sequence star?
A star's nuclear fusion reaction converts hydrogen into helium, and generates energy through this process. A "new" star has a fairly low percentage of helium, but over the course of billions of years, it fuses the hydrogen "fuel" into helium "ash".
What percentage of the Sun is composed of helium?
The sun in composed of 25 percent helium. The other 75 percent is hydrogen. The sun also has small amounts of other elements such as neon, oxygen, carbon, and magnesium.
What is helium composed of?
Helium atoms.
Uranus' atmosphere is composed of what?
Helium.
What is composed on only one type of molecule?
What is composed of only one type of molecule
What is the percentage of land in Jupiter?
Jupiter is a gas giant and does not have a solid surface like Earth, so it does not have a percentage of land. It is primarily composed of hydrogen and helium gases, with no solid landmass.
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.
Which planet is composed of gases?
Jupiter is composed mainly of gases (hydrogen and helium).
What kind of stars are mainly composed of hydrogen?
Main sequence stars, like our Sun, are mainly composed of hydrogen. These stars fuse hydrogen into helium in their cores, releasing energy in the form of light and heat. This process allows them to shine bright in the sky.
What percentage of a star's total lifetime is spent on the main sequence?
Roughly 90% of a star's total lifetime is spent on the main sequence, where it fuses hydrogen into helium in its core. After this stage, the star will evolve off the main sequence and follow a different path, such as becoming a red giant or a supernova.
What is the composition of main sequence stars?
Main sequence stars are composed primarily of hydrogen and helium, with small amounts of heavier elements. These stars generate energy through nuclear fusion in their cores, converting hydrogen into helium. The temperature and pressure conditions in the core of a main sequence star are ideal for sustaining this nuclear fusion process, which is what allows them to shine steadily over long periods of time.
