by neufer » Sun Jan 19, 2014 2:19 pm
michaelwaltrip wrote:
Do all super massive black holes spin? (Do all black holes spin? or is this theory).
Almost all things spin.
(However, the Higgs boson, mesons, helium-4, and Carbon-12 all have zero spin.)
Black holes have only three properties: mass, spin, & electrical charge.
Of these three, probably only the electrical charge is close to zero.
michaelwaltrip wrote:
I am trying to imagine the energy of the momentum or such a thing.
Good luck with THAT!
michaelwaltrip wrote:
This must (my speculation) a contributing factor to the "black" gravity of it all.
http://en.wikipedia.org/wiki/Dark_matter#History_of_the_search_for_its_composition wrote:
<<Early theories of dark matter concentrated on hidden heavy normal objects, such as black holes, neutron stars, faint old white dwarfs, brown dwarfs, as the possible candidates for dark matter, collectively known as massive compact halo objects or MACHOs. Astronomical surveys for gravitational microlensing, including the MACHO, EROS and OGLE projects, along with Hubble telescope searches for ultra-faint stars, have not found enough of these hidden MACHOs.>>
michaelwaltrip wrote:
Are black holes every destroyed? Do they have a life cycle?
A miniscule black hole of mass of 228 tonnes will self-destruct in 1 second into a violent burst of gamma rays.
A tiny black hole of mass of 72 kilotonnes (~
Yamato-class battleship)will self-destruct in 1 year.
A small black hole of mass of 72 megatonnes will self-destruct in a billion years.
However,
all stellar mass black holes that we know about will survive for around a
googol years.
[quote="michaelwaltrip"]
Do all super massive black holes spin? (Do all black holes spin? or is this theory).[/quote]
Almost all things spin.
(However, the Higgs boson, mesons, helium-4, and Carbon-12 all have zero spin.)
Black holes have only three properties: mass, spin, & electrical charge.
Of these three, probably only the electrical charge is close to zero.
[quote="michaelwaltrip"]
I am trying to imagine the energy of the momentum or such a thing.[/quote]
Good luck with THAT!
[quote="michaelwaltrip"]
This must (my speculation) a contributing factor to the "black" gravity of it all.[/quote][quote=" http://en.wikipedia.org/wiki/Dark_matter#History_of_the_search_for_its_composition"]
<<Early theories of dark matter concentrated on hidden heavy normal objects, such as black holes, neutron stars, faint old white dwarfs, brown dwarfs, as the possible candidates for dark matter, collectively known as massive compact halo objects or MACHOs. Astronomical surveys for gravitational microlensing, including the MACHO, EROS and OGLE projects, along with Hubble telescope searches for ultra-faint stars, have not found enough of these hidden MACHOs.>>[/quote]
[quote="michaelwaltrip"]
Are black holes every destroyed? Do they have a life cycle?[/quote]
A miniscule black hole of mass of 228 tonnes will self-destruct in 1 second into a violent burst of gamma rays.
A tiny black hole of mass of 72 kilotonnes (~ [url=http://en.wikipedia.org/wiki/Yamato-class_battleship]Yamato-class battleship[/url])will self-destruct in 1 year.
A small black hole of mass of 72 megatonnes will self-destruct in a billion years.
However, [u]all stellar mass black holes that we know about[/u] will survive for around a [url=http://en.wikipedia.org/wiki/Googol]googol[/url] years.