Black Holes - Roger Blandford (SETI Talks)

[cipher2]

Can you count how many times he says uhh, ahh and uum? If you can than you also possess the ability to count the stars in the universe or the grains of sand on the beaches of earth....uh um ahhh, uh uh, um. Never understood why intellectuals need so many filler words.

[bdogshredder]

@cipher2 It aaaa, umm , KILLS me! I can't watch it.

[Typho0n86]

@1.06.35, that a black hole will evaporate if you wait a long time 10^56~ why cant they say that the big bang came from a black hole!!!!! its all there!!!!!!!!!!

[setiinstitute]

@Typho0n86 Hi Typhoon, yes Lee Smolin has this idea as part of his Fecund Universe theory. You may want to google Lee Smolin to check it out, it's an interesting idea about evolutionary universes - not much proof to it, but interesting.

[Typho0n86]

@ 26.44 never to return.. what about a big bang??

[retepvosnul]

"two neurton stars of 1.4 solar masses combined trying to become a 2.8 solar mass neutron star.. Can not do that, Oppenheimer told us that".

Is that right ? I thought Shandrasakar told us that, hence the Shandrasakar limit of 1.4

[dgumbrecht]

@retepvosnul

From my understanding of the Chandrasekhar limit, it applies only to the upper mass limit for a white dwarf star. As neutron stars consist of an entirely different form of matter than white dwarves, perhaps Oppenheimer did the physics for neutron star collapse.

This is speculation on my part, as I don't know the relevant science from Oppenheimer.

[retepvosnul]

@dgumbrecht You are right, the upper limit for neutron stars is the Tolman-Oppenheimer-Volkoff limit. Different sources give different numbers, but it ranges from 1.5 to 3 solar masses. So indeed Oppenheimer, in a way gave us reason to believe this is not possible. My bad.

[impis8]

A bit too many ummmms and ahhhhhhhs for my liking, sorry.

[RiVvenGuard]

LOL....

[sbergman27]

He smooths out after the first few minutes and becomes a very clear and enjoyable speaker to listen to. Skip to about 10:00.

[johnjaksic61]

@sbergman27

Correctly put and very enjoyable lecture.

[DRCJEL]

this is a long vid i fell asleep

[delysid111]

The black hole is an advanced from from an over pressurized Neutron star. The result is either a Pulsar, Magnetar or a Supernova. It is a second stage star fomation. He implies that two Ma or Pu do orbit. When they merge, a Blach hole, with TWIN jets occur. For the BH to evolve into a Quasar depends on the mass. When the two cores merge in high rotating freq, two products are produced. radio and mass. At that point you must consider each part of energy with its own integrity.

[impis8]

This is all just speculation though, isn't it?

[tomy4you]

@impis8

what do you mean by speculation?

For instance Prof. Reinhard Genzel, Director of the Max Plank Institute was observing the centre of Milky Way for nearly (or over) 10 years and discovered super-massive black hole there, for which he was awarded the Shaw prize (2008). Start reading on this. It used to be speculation (early XX) but it's been now becoming common knowledge...

[rbolo29]

LOL, Jill Tarter with a no signal display on power point screen...ironic.