Black holes aren't just cosmic vacuums; they have a temperature and entropy!
Black hole thermodynamics
Black holes aren't just cosmic vacuums; they have a temperature and entropy!
Imagine a black hole as a cosmic vacuum cleaner, sucking in everything around it. Just like a vacuum cleaner has a filter that gets dirty over time, black holes have a boundary called the event horizon that gets "messier" as they absorb more stuff.
The messier the event horizon, the more "stuff" it has absorbed, which is like the black hole's entropy. The area of this boundary is what physicists use to measure this messiness.
Example
If a black hole's event horizon doubles in size, its entropy also doubles, because there's twice as much cosmic "stuff" inside it now.
Remember this
The entropy of a black hole is directly proportional to the area of its event horizon.
Text adapted from Wikipedia, licensed under CC BY-SA 4.0.
Related concepts
Hawking radiation
Black holes emit Hawking radiation and evaporate over time
Black hole information paradox
Black holes, once thought to trap everything, might actually leak secrets through Hawking radiation
Fermi paradox
Information paradox questions black hole information fate
Schwarzschild metric
Schwarzschild radius at r=2GM/c² marks the event horizon
Kerr metric
Kerr metric describes rotating black hole spacetime
Einstein field equations
Einstein field equations relate spacetime curvature to energy-momentum tensor
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