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Black holes can't be observed directly. The Hawking Radiation is so weak, that it will perhaps never be observed.Black holes are detected indirectly, basically by their gravitational effects. This includes:

* Gravitational lensing of objects behind the black hole

* Observing objects that orbit the black hole

* The accretion disk of a black hole can become extremely hot, making some black holes the brightest objects in the Universe!

All of these are effects that happen OUTSIDE the black hole proper.

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