Comments on: 1300 black holes

By: Astronomers may have witnessed a star torn apart by a black hole | Bad Astronomy | Discover Magazine « SpaceJibe

Sat, 30 Apr 2011 23:55:59 +0000

[...] wanders too close, it forms a disk around the hole called an accretion disk. This disk heats up and can emit tremendous amounts of light (as in this illustration here). Some galaxies are continuously feeding of material like this, and [...]

By: sagimbagi

sagimbagi — Fri, 04 Jul 2008 10:00:10 +0000

i thought mmmmm..m.m very goood no you very smart yet you ave not explained what the other galaxyes are have you now? have you found kashyykk yet are their wookies is luke really straight or si it an act he seems friendly involved with chewy peter puppa kiss his bum and all he could tast was puperdum trerima kashi pak

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guv2000 » karadelikler renkli midir veya parlar mÄ± ? — Sun, 08 Apr 2007 01:44:56 +0000

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By: Best Posts from around the Web » 1300 black holes

Best Posts from around the Web » 1300 black holes — Mon, 02 Apr 2007 18:22:10 +0000

[...] Original post by The Bad Astronomer [...]

By: Chipping the web - revolution -- Chip’s Quips

Chipping the web - revolution -- Chip’s Quips — Thu, 15 Mar 2007 17:04:16 +0000

[...] Also via Paul: who would have thought that black holes are bright? [...]

By: DenverAstro

DenverAstro — Thu, 15 Mar 2007 01:59:51 +0000

Actually, Black Holes have 4 major measurable characteristics;
Mass
Charge
Spin
and the lesser known poopie pants factor.
As in, you get close enough and that is one Scarey Mother! )

(I hope you folks dont mind my space-warped sense of humor)

By: Buzz Parsec

Buzz Parsec — Wed, 14 Mar 2007 04:31:46 +0000

When BA mentioned black holes feeding and not feeding, it somehow made me thing of Richard Dreyfuss saying “Boys… He’s back for his noon feeding…” We’re gonna need a bigger telescope!

By: » Links for 14-03-2007 » Velcro City Tourist Board » Blog Archive

» Links for 14-03-2007 » Velcro City Tourist Board » Blog Archive — Wed, 14 Mar 2007 03:40:30 +0000

[...] – 1300 black holes “Ironically, black holes arenâ€™t too hard to find. Theyâ€™re bright. Hereâ€™s a bunch of [...]

By: Melusine

Melusine — Wed, 14 Mar 2007 00:54:39 +0000

Blondin Says:

Wow! Thatâ€™s almost enough black holes to fill the Albert Hall!

That was good.

By: Melusine

Melusine — Wed, 14 Mar 2007 00:52:21 +0000

The physics class I took at college level for non-physics majors did not cover black holes. It did involve equations, but of the classical physics kind, and certainly not the difficult more dense ones (such as Maxwell’s, etc.) Also, unless one is a physics major (or just very smart with a great memory), a lot of people forget what they learn apart from their major. Heck, we studied the American Revolution and the Constitution how many times throughout school life and people STILL can’t get their facts straight!

Just sayin’ have mercy on the non-physics majors.

By: Zero

Zero — Tue, 13 Mar 2007 18:51:37 +0000

Awesome reference Blondin, made me laugh

That image is just too damn cool. I actually finished writing the exam for my first college physics course a few hours ago. I’m studying computer science and it was about the physics of sensors. Alas, no accretion disks were mentioned.

Is it only the black holes in galactic centers that send out electromagnetic radiation in the x-ray and gamma ranges? I guess none of this is related to Hawking radiation – that’s thermal radiation, right?

*goes to sign up for more physics courses*

By: Tuesday Morning Science Roundup at Heyblinkin.net

Tuesday Morning Science Roundup at Heyblinkin.net — Tue, 13 Mar 2007 16:52:24 +0000

[...] Chandra took a bunch of pictures of active galaxies. Bad Astronomy has a write up about the observation of black holes and what this means for modeling them. Read on [...]

By: Gary Ansorge

Gary Ansorge — Tue, 13 Mar 2007 16:16:26 +0000

Hmmm, Kerr Vacuum. Still doesn’t tell how to know the dang thing is rotating. The only effect that might be conclusive is in the detection of temporal effects, ie, as in the temporal wormhole as a real world solution for lovers of time travel stories(myself included. I just love paradoxes.)

Yes, I just had to read it for myself. That’s sort of the very definition of a mystic,,,”Please mom, I’d rather do it myself,,,”,,,(Never trust a priest who hasn’t been there to tell you about ultimate realities,,,)

I’m not enough of a mathematician to claim full understanding of the equations, mainly because I’m too dang lazy to work them out however, I do have a very visual mind, and the imagery SEEMS fairly clear,,,
Ah well, perhaps I just don’t realize what I don’t know but it was an interesting article,,,

Thanks, csrster for the reference,,,

GAry 7

By: MichaelS

MichaelS — Tue, 13 Mar 2007 15:04:55 +0000

That’s really cool! (Err, I suppose it’s actually quite hot, but it’s still interesting. )

But, uh, I never even took gradeschool physics. Still working on my Associates, then I’ll go for the BS and take physics as an elective (I’m going into a computer field). I’m not even sure what is offered, but I want to take astronomy, physics and biology. And it’s all your fault I’m taking astronomy.

By: SF Reader

SF Reader — Tue, 13 Mar 2007 14:13:34 +0000

What are the chances that “dark matter” is just a bunch of black holes and neutron stars that aren’t munching anything at the moment? Too scattered to do coherent (and thus recognizable) gravitational lensing, too many to affect planetary orbits like a single black hole in the Oort cloud or Kuiper belt might, but certainly massive enough to invalidate our mass models.

Or would we be seeing too many short occultations or lensing events?

By: El Guapo

El Guapo — Tue, 13 Mar 2007 13:53:45 +0000

What would our sky look like at night if our galaxy’s black hole was currently feeding?

By: bassmanpete

bassmanpete — Tue, 13 Mar 2007 11:12:20 +0000

csrster, I did as you suggested to Gary because I was feeling brave but when I faced the enemy I turned & ran, screaming

By: csrster

csrster — Tue, 13 Mar 2007 09:11:56 +0000

Gary, if your feeling really brave look up “Kerr Metric” on Wikipedia.

By: Kaptain K

Kaptain K — Tue, 13 Mar 2007 06:13:11 +0000

“…black hole … have only two qualities. Mass and charge.”
=====

Make that THREE qualities … mass, charge and spin.

By: autumn

autumn — Tue, 13 Mar 2007 04:55:09 +0000

Isn’t the angular momentum of the collapsing object also conserved as it becomes a black hole? I seem to remember that there was some amount of surprize from physicists when a soloution to the general relativity equations was found that described a rotating object becoming a black hole.

By: Gary Ansorge

Gary Ansorge — Tue, 13 Mar 2007 03:00:20 +0000

I saw a calculation done several years ago that indicated we could potentially retrieve up to 50% of the energy in any mass by spiraling it into a rotating black hole. What wasn’t particularly clear to me was how do you determine(or create) a rotating black hole. From what I recall of my black hole physics, it can really have only two qualities. Mass and charge. So how can we even know if it’s rotating?

Way cool pics, by the way,,,looking forward to GLAST,,,

GAry 7

By: Ed

Ed — Tue, 13 Mar 2007 02:10:17 +0000

That’s pretty amazing. The amount of energy and mass involved is just mind boggling. And that 1300 is just one tiny chunk of the sky.

I saw Joe Rogan (of BA moon hoax debate fame) in Denver the other day. It was a regular stand up comedy act. He did a bit about how people feel insignificant looking at the Grand Canyon. Joe gestured wildly up at the sky (ceiling…); “Look at ALL that up there! You can take a 6 hour donkey ride to the bottom of the Grand Canyon, it’s just a ditch!”

Here’s a Q and BA question: What would it look like on Earth if the Milky Way’s black hole were active? And how good of a tan would I get standing outside?

By: PK

PK — Mon, 12 Mar 2007 23:52:17 +0000

I remember the time when black holes were only a hypothesis. And now look: 1300 in a single picture!

By: Serenitude

Serenitude — Mon, 12 Mar 2007 23:21:13 +0000

Another utterly fascinating article, BA. Yet another example of why your page is one-stop shopping for fascinating Astronomy and should be checked at least thrice-daily. Keep up the good work!

PS: The image also makes a nice desktop

By: Erlando

Erlando — Mon, 12 Mar 2007 23:20:56 +0000

Cool picture And again I learned something..

Your search-link for GLAST is not quite accurate – you gave the admin-side search link. You probably meant http://www.badastronomy.com/index.php?s=glast.