What Is the Size of a Black Hole?

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SUMMARY

The size of a black hole is defined by its event horizon, which can vary significantly depending on its mass. For stellar black holes, the diameter can be several kilometers, while supermassive black holes can reach millions of kilometers across. The concept of size in relation to black holes is complex, as their event horizons are not fixed and can change with mass accretion. Additionally, the Planck length, approximately 1.6 x 10-35 meters, represents a theoretical limit beyond which current physics cannot accurately describe phenomena.

PREREQUISITES
  • Understanding of general relativity and its implications on spacetime.
  • Familiarity with the concept of event horizons in black hole physics.
  • Basic knowledge of quantum mechanics, particularly the Planck scale.
  • Awareness of astrophysical measurements and units, such as kilometers and wavelengths.
NEXT STEPS
  • Research the properties of black holes, focusing on the Schwarzschild radius.
  • Explore the relationship between mass and size in different types of black holes.
  • Study the implications of quantum mechanics on black hole physics, particularly regarding the Planck length.
  • Investigate current theories on black hole formation and growth, including accretion processes.
USEFUL FOR

Astronomers, astrophysicists, and students of physics seeking to deepen their understanding of black hole characteristics and their implications in modern science.

George
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Can anyone say how big a black hole is? Could its diameter be less than the distance that light can travel - ie less than one wavelength?
 
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One wavelength at what frequency? Waves can be as small, I guess, as the Planck length. Or smaller?
 

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