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All stars are in a balance between gravity crushing them in, and the pressure caused by nuclear fusion at the star's core. And the bigger the star, the greater the amount of energy generated.
At some point, the pressure of the stellar fusion is SO powerful that the outer layers of the star are blasted off into space. That point, we believe, is at about 150 solar masses.
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What are the five medium stars?
The five medium stars are the Sun, Alpha Centauri A, Sirius A, Vega, and Capella. These stars have masses and luminosities greater than average stars like our Sun, but are not as massive or luminous as giant stars.
What is the final stage for stars whose final masses are greater than three times the mass of the sun?
Stars more than about 3 times the mass of the sun are likely to wind up as neutron stars. Stars more than about 10 times the mass of the sun will probably end up as black holes.
Why is there an upper mass limit for main-sequence stars of about 100 solar masses?
The upper mass limit for main-sequence stars is around 100 solar masses because the intense radiation and stellar winds in massive stars lead to mass loss through stellar winds and prevent the star from accreting enough material to exceed this limit. Additionally, stars with masses above 100 solar masses would generate such strong radiation pressure that it would overcome the force of gravity, preventing the formation of stable stars with higher masses.
What is the difference between stars that become white dwarfs stars that become neutron stars and stars that become black holes?
The difference is in mass. Low to medium mass stars (up to about 8-10 solar masses) become white dwarfs. Massive stars (10 to 25 solar masses) become neutron stars. Stars above 25 solar masses tend to become black holes.
What affect does gravity have on all matter in the universe?
Because of the existence of 'gravity', there are a pair of equal forces between every two specks of mass in the universe. Greater masses and smaller separations result in greater forces. These simple facts lead to the formation of galaxies, stars, and planets, and to virtually all of the motions we see, including orbits.
Why are there no stars with masses much greater than 100M?
Stars with masses greater than 100 times that of the Sun would burn their fuel so rapidly that they would not have enough time to reach the main sequence before exhausting it and ending their lives in violent supernova explosions. Therefore, there are no stars with masses much greater than 100 solar masses currently observable in the universe.
Where in the universe are heavy elements with masses greater that that of helium being produced today?
In the interior of certain massive stars.
Why do planets orbit stars and moons orbit stars?
Because stars have a greater amount of gravity
Why are the sun and stars attracted to each other even though they have same charge and mass?
They are attracted to one another by gravity, which is not affected by electrical charge. Gravity is an attractive force that occurs between all objects with mass. You don't have positive and negative masses that attract and repel. The greater the mass, the greater the attraction. Second, the stars do not all have the same mass. The masses of stars vary considerably.
What are the five medium stars?
The five medium stars are the Sun, Alpha Centauri A, Sirius A, Vega, and Capella. These stars have masses and luminosities greater than average stars like our Sun, but are not as massive or luminous as giant stars.
What is the final stage for stars whose final masses are greater than three times the mass of the sun?
Stars more than about 3 times the mass of the sun are likely to wind up as neutron stars. Stars more than about 10 times the mass of the sun will probably end up as black holes.
Why can you see the stars when the sky is dark?
Because during the day - the Sun's luminosity is greater than the stars.
What are Binary stars used to determine?
The masses of the two stars.
Why are there no stars with masses less than 0.08 M?
There are no stars smaller than 0.08 Msun because any object smaller than that is not able to become hot enough to burn hydrogen in their cores. The brightest star in the Earth's sky is called Sirius.
What is a stars mass?
This is too broad. All stars have different masses.
Why is there an upper mass limit for main-sequence stars of about 100 solar masses?
The upper mass limit for main-sequence stars is around 100 solar masses because the intense radiation and stellar winds in massive stars lead to mass loss through stellar winds and prevent the star from accreting enough material to exceed this limit. Additionally, stars with masses above 100 solar masses would generate such strong radiation pressure that it would overcome the force of gravity, preventing the formation of stable stars with higher masses.
What is the difference between stars that become white dwarfs stars that become neutron stars and stars that become black holes?
The difference is in mass. Low to medium mass stars (up to about 8-10 solar masses) become white dwarfs. Massive stars (10 to 25 solar masses) become neutron stars. Stars above 25 solar masses tend to become black holes.
