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Approximately 10% of stars are larger and more massive than the Sun. Most stars in the universe are smaller, with a significant portion being red dwarfs, which are much less massive. The distribution of stellar masses typically follows the Salpeter distribution, where lower-mass stars are more common than higher-mass stars.
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What causes some stars to be brighter than others?
In absolute terms larger (more massive) stars shine more brightly than less massive ones. In relative terms (as seen from Earth) more distant stars appear dimmer than closer ones.
Do the stars on the main sequence illustrate the mass-luminosity relationship?
Luminosity depends directly on mass because more massive main-sequence stars do not need to graviationally contract as far to reach fusion temperatures, and so they have a larger volume and contain a much larger amount of light energy, which diffuses out and generates a higher luminosity, very roughly in proportion to the higher volume.
Which star is larger neutron star or subgiant star?
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
Do bigger stars use hydrogen more rapidly?
Yes, larger stars consume hydrogen at a faster rate due to their higher mass and temperature, leading to more intense nuclear fusion reactions. This results in a shorter lifespan for massive stars compared to smaller ones.
How the lifetime of stars depend on their mass?
The lifetime of a star is determined by its mass because more massive stars burn through their fuel faster due to higher core temperatures and pressures. Higher-mass stars undergo fusion at a quicker rate, leading to a shorter lifespan compared to lower-mass stars. Conversely, lower-mass stars burn their fuel more slowly, allowing them to exist for billions of years.
Is the color at the star related to its size?
Generally, yes. For stars on the main sequence, meaning that they fuse hydrogen at their cores, mass, size, color, brightness, and temperature are all closely related. More massive stars are larger, brighter and hotter than less massive ones. The least massive stars are red. As you go to more massive stars color changes to orange, then yellow, then white, and finally to blue for the most massive stars.
What causes some stars to be brighter than others?
In absolute terms larger (more massive) stars shine more brightly than less massive ones. In relative terms (as seen from Earth) more distant stars appear dimmer than closer ones.
Why mass is so important in determining the evolution of a star?
Hydrogen, helium, and carbon fuel are found in more massive stars. The diameter of more massive stars is bigger. Helium is found in greater abundance in more massive stars. The weight of more massive stars is greater.
Why do the largest stars with the greatest amount of hydrogen fuel in their cores burn out the quickest?
Larger stars, or to be more precise, more massive stars, have more gravity; therefore they get denser and hotter, therefore the nuclear reactions occur much faster. This is quite disproportionate; a massive stars may be, say, a hundred times more massive than a red dwarf, but burn fuel at a rate that is millions of times faster.
Do the stars on the main sequence illustrate the mass-luminosity relationship?
Luminosity depends directly on mass because more massive main-sequence stars do not need to graviationally contract as far to reach fusion temperatures, and so they have a larger volume and contain a much larger amount of light energy, which diffuses out and generates a higher luminosity, very roughly in proportion to the higher volume.
Are larger stars brighter but have a short lifespan?
Only if you "larger" you mean "more massive". The size (diameter) of a star may change quite a lot over its lifetime.
What forms massive stars?
Stars are made mostly from hydrogen. The more hydrogen available when a star is formed, the more massive it will be.
How big are blue supergiants?
Blue supergiants are among the most massive and luminous stars in the Universe. They can be up to 20 times more massive than the Sun and have radii several hundred times larger. These stars are relatively rare compared to other types of stars.
Are all-stars in the same galaxy?
No, there are more massive galaxies with stars in them.
Is sun one of the largest stars in the galaxy?
No. The sun is larger than the average star but is nothing out of the ordinary.
Why have none of the stars from the big dipper ever fallen?
The stars are unimaginably far away, well beyond any influence from Earth. Even then, they are far larger and more massive than Earth is.
How do a stars radius compare with their mass?
The radius of a star is generally proportional to its mass. More massive stars tend to have larger radii compared to less massive stars. This relationship is governed by the balance between the gravitational force pulling the star inward and the pressure from nuclear fusion reactions pushing outward.
