Question about black holes and white dwarf

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SUMMARY

The discussion clarifies the sizes of various astronomical objects: the Sun is approximately 100 times the diameter of Earth, while a white dwarf is roughly the same size as Earth, depending on its mass. A neutron star has a radius of about 10-15 km, making it comparable to the size of a city. Black holes can vary significantly in size, defined by their mass and event horizon. The conversation also touches on quasars and quark stars, indicating that quasars are active black holes at the centers of galaxies, while quark stars are theorized to be more compact than neutron stars but less so than black holes.

PREREQUISITES
  • Understanding of astronomical objects and their classifications
  • Knowledge of black hole physics and event horizons
  • Familiarity with stellar evolution and the lifecycle of stars
  • Basic concepts of mass and size in astrophysics
NEXT STEPS
  • Research the properties and characteristics of black holes, focusing on event horizons
  • Explore the differences between neutron stars and quark stars
  • Learn about quasars and their role in the universe
  • Investigate the lifecycle of stars, particularly the transition from main sequence to white dwarf
USEFUL FOR

Astronomy enthusiasts, astrophysics students, and anyone interested in understanding the sizes and characteristics of celestial bodies such as black holes, neutron stars, and white dwarfs.

hager mahdy
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hi
i want to ask aquestion
what is the biggest qatar:
black hole or white dwarf or nutron star or the sun
please i want to know the biggest one and then and then and the smallest one
thaaaank you very much
 
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Well the word "qatar" doesn't make any sense, but it is clear what you are asking.

The sun is about 100 times as big (in diameter) as earth

A white dwarf is roughly the same size as the earth, depending on its mass.

A neutron star is about the size of a city, 10-15 km in radius.

A black hole can be any size, depending upon its mass.
 
nicksauce said:
Well the word "qatar" doesn't make any sense, but it is clear what you are asking.

The sun is about 100 times as big (in diameter) as earth

A white dwarf is roughly the same size as the earth, depending on its mass.

A neutron star is about the size of a city, 10-15 km in radius.

A black hole can be any size, depending upon its mass.

I'm guessing he means either quark-star, or quasar.

Hager Mahdy, if you did mean Quasar, they are believed to be the active nuclei of distant galaxies, and therefore are black holes. If you meant Quark-Star (possibly a step between Neutron Star and Black Hole) then no one knows, but it would be more compact than the former, and less so than a black hole.

Remember that a black hole is best defined by its event horizon, which is purely a function of its mass, as Nicksauce said. They seem to get quite massive, especially AGNs.
 
thank you very much and iam sorry but i mean diameter
thaank you
 

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