Milky Way is a black hole

[darknrg]

following black hole theory an event horizon is the point of no return for pretty much everything however the sigularity does not have to be a specific size, a theoretical black hole the size of the solar system need only be as dense as liquid water to have the gravity capable of establishing an event horizon <br />not that this would happen of course if a body of water this size was to exist it would instantly collapse. <br />A black hole the size of our galaxy need only be as dense as ....you guessed it our galaxy for the event horizon criteria to be met.....<br />if so how can we see other galaxys??<br />maybe we can only see some ....accounting for some of the darkmatter???<br />something to ponder <br />your views please<br />please correct me if im wrong but this came right out of the book

 

[harmonicaman]

<i>"...but this came right out of the book."</i><br /><br />What book?

 

[darknrg]

I knew that was coming <br />im not sure anymore<br />i think it might be the physics of star trek<br />or that stardust, im sure it was one of them freebies you get with new scientist

 

[bonzelite]

i think our galaxy is really a giant hippo and our sun is a milkshake. yesterday i found a used red hole in a thrift store. i may post pics of it when i recover from being a giraffe tomorrow. <br /><br />

 

[bonzelite]

indeed. <br /><br />hallucinagens can be fun <img src="/images/icons/smile.gif" /><br />

 

[harmonicaman]

Physics of Star Trek.

 

[darknrg]

i thought this was a place for intelligent discusion<br />it was a quite matter of fact section of the book<br />rubbish it all you want, im just saying what i read<br />i asked you to correct me if im wrong not get into a playground slanging match<br />they should keep kids outta here!

 

[telfrow]

So what was the book? <br /><br />Author's name? Title? Link? <div class="Discussion_UserSignature"> <strong><font color="#3366ff">Made weak by time and fate, but strong in will to strive, to seek, to find and not to yeild.</font> - <font color="#3366ff"><em>Tennyson</em></font></strong> </div>

 

[darknrg]

the physics of star trek<br />by Lawrence m Kraus<br />its a great book give it a go<br />http://www.amazon.com/gp/product/0060977108/002-6944552-9898430?v=glance&n=283155

 

[tony873004]

The Milky Way is about 10^12 solar masses. If you plug this into the formula for Schwarzschild radius:<br /><br />r=2GM/c^2<br /><br />you'll find that the Milky Way would have to be crammed into a sphere less than 20,000 AU in order to have an event horizon.

 

[darknrg]

right ok then i stand corrected i thought it was strange hence me raising the issue<br /><br />"we can only go by what we're told" Me 2005

 

[bonzelite]

i think we started funning around because, c'mon --the Milky Way IS a black hole? c'mon, dude.

 

[darknrg]

ok<br />but would you believe me if i said it sounded good at the time<br />but thats nothing compared to the guy that thought that black holes bend light with heat that why i joined, to put things straight, he wasn't treated to sarcasm

 

[darknrg]

sorry peeps i was mistaken its not our galaxy or any other for that matter which light is unable to escape from..... its the entire universe<br /><br />Some Schwarzschild Radii<br />We can calculate the Schwarzschild radius for the mass of the Earth: it works out to be about one-third of an inch. What this means is that if we could compact the Earth so that its radius gets down to one-third of an inch, the gravitational attraction becomes strong enough that the Earth gets crushed out of existence, creating a black hole.<br /><br />The comparable figure for the mass of the Sun is about 1.1 kilometers.<br /><br />For a mass of 2.5 x 1053 kg, i.e. a 2 and a 5 followed by 52 zeroes kg, the Schwarzschild radius is about 17 billion light years. This huge mass is an estimate for the total mass of the universe. Also, given that the age of the universe is 15 billion years or so, 17 billion light years is awfully close to the size of the universe. Does this mean that the universe itself is a black hole?<br /><br />It turns out that this question is the same as asking: is the universe closed. If the universe is closed, then it is fairly accurate to say that it is a black hole.<br /><br />for more info read here:<br />http://www.mathpages.com/home/kmath339.htm

 

[bonzelite]

<font color="yellow"><br />It turns out that this question is the same as asking: is the universe closed. If the universe is closed, then it is fairly accurate to say that it is a black hole. </font><br /><br />i think people who actually believe in black holes may have a difficult time following your reasoning. <br /><br />is english not your native language, may i ask?

 

[darknrg]

yes english is my native language as i was born, raised and educated there <br />what may i ask led you to believe otherwise?<br />also what would anyone that knows about black holes find hard to follow in any of the above??

 

[bonzelite]

<font color="yellow"><br />yes english is my native language as i was born, raised and educated there <br />what may i ask led you to believe otherwise? </font><br /><br />you've got to be kidding. have you tried reading your own posts?

 

[darknrg]

i really have no idea what your talking about, furthermore im sure nobody else does here either.<br />ive read through my posts and all are coherent ....whats your problem?<br />

 

[bonzelite]

LOL! <br /><br /><br />

 

[kmarinas86]

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970408c.html<br /><br /><font color="yellow">The Question<br />(Submitted April 08, 1997)<br /><br />If the total mass/energy of Universe was at its beginning in such a minimum sphere of 10E-33 or more, why does it exist? Such an extraordinary condition and diameter is the same as it is valid for black holes. Why does the Universe exist, although its total mass was within the Schwarzschild radius? <br /><br /><br />The Answer<br />This is a very good question, and I will do my best answering it. <br />In the case of a black hole, the Schwarzschild radius is mathematically the radius in at which one would have to be moving at the speed of light in order to escape. Or, the radius that nothing can escape. This is only a function of the mass -- not the density. <br /><br />Putting the numbers in, the Schwarzschild radius (Rsch) is given by: <br /><br />Rsch = 3km x Mass; Where the Mass is measured in solar masses. <br /><br />Now, when do we get a black hole? Answer, when the Schwarzschild radius is bigger than the object we think might make a black hole. <br /><br />The Sun (Mass = 1 solar mass) is not a black hole because it is bigger than 3 km. If we magically shrunk in down to 3km in radius, then it would become a black hole. <br /><br />Now back to your question: Why then was the early Universe not a black hole? Well, lets figure out its Schwarzschild radius to get a basic rule of thumb idea of what is going on. <br /><br />Rsch = 3km x Mass of the whole Universe in solar masses <br />= about 10 to 100 billion light years <br />= about the current size of the whole Universe <br /><br /><br />So, in the basic definition of a black hole I used above (where the size of the object is smaller than the Schwarzschild radius) the whole Universe is one big black hole with us on the inside. <br /><br />Therefore, the simple answer is that we are inside the event</font>

 

[kmarinas86]

http://www.google.com/search?q=2*G*10%5E30kg*1.99*10%5E12*10%5E11%2Fc%5E2+in+light+years<br /><br />(2 * G * ((10^30) kg) * 1.99 * (10^12) * (10^11)) / (c^2) = 3.12354234 × 10^10 light years<br /><br />Imagine what the universe was like when the universe was 10% of its present age.

 

[darknrg]

thank you very much kmarinas86 <br />that made things alot clearer for me<br /><br />ps<br />see everyone else understood my point.<br />looks like the "lol" is on you bonzelite.<br />i remember being a teenager myself<br />a most troubled time, you are obviously starved of attention <br />have you ever thought about getting a girlfriend??<br />i have noticed you only type one sentence answers and no wonder... <br />the state your keyboard is in i wouldnt want to touch it either<br /><br />jeez where did they find this guy?<br />

 

[bonzelite]

it's very tempting to take that bait, but i won't. <br /><br />and we move on...