: 1) Could planets orbit a Blackhole??(perhaps now you can see the thought process of my previous question "Sphere of influence").

Yes.

: : 2) Blackholes emit a huge amount of x-rays/heat as matter collapses into the event horizon-could this energy support life on those planets??

:I would think that kind of radiation would be more detrimental to than supportive of life, but that doesn't mean a planet might not be warmed by tidal effects from its moons or visa-versa. Having no significant light source another problem is the lack of photosynthesis. : : 3) IF question 2 is possible then perhaps Blackholes are the best place to search for intelligent life because...

Probably not.

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