All you'd ever want to know about Black Holes

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erikiksaz

Diamond Member
Nov 3, 1999
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Here it is

I'm taking an astronomy class, and we're currently on the subject of Black Holes. Most people think that they're like giant vaccuum cleaners, when in fact they are not! You can watch from a ways out quite safely, not that there'd be much interesting to see :p

Anyways, have fun.
 
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wfn

Senior member
Feb 14, 2001
864
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that was stephen hawking...

first he had a drawn out theory that nothing can escape a black hole and like 15 years later hes disproved it
 
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phonemonkey

Senior member
Feb 2, 2003
806
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You know, it probably isn't a good idea to try to read this while I'm walking people through how to refill the paper in their printers...great article, though.
 
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Jpark

Platinum Member
Nov 15, 2003
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There is another way to look at this whole business. In a sense, time really does pass more slowly near the horizon than it does far away. Suppose you take your spaceship and ride down to a point just outside the horizon, and then just hover there for a while (burning enormous amounts of fuel to keep yourself from falling in). Then you fly back out and rejoin Penelope. You will find that she has aged much more than you during the whole process; time passed more slowly for you than it did for her.
Click to expand...

I don't quite grasp this. How would it be possible?

great reading btw
 
Chaotic42

Chaotic42

Lifer
Jun 15, 2001
34,227
1,383
126
Originally posted by: jpark932
There is another way to look at this whole business. In a sense, time really does pass more slowly near the horizon than it does far away. Suppose you take your spaceship and ride down to a point just outside the horizon, and then just hover there for a while (burning enormous amounts of fuel to keep yourself from falling in). Then you fly back out and rejoin Penelope. You will find that she has aged much more than you during the whole process; time passed more slowly for you than it did for her.
Click to expand...

I don't quite grasp this. How would it be possible?

great reading btw
Click to expand...

Time and space are distorted near a black hole (everything with mass distorts time and space).
 
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jamesave

Golden Member
Aug 27, 2000
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Is light considered as a mass? if not, would it be considered as something that the gravitation can pull?

all my minds still thinking that gravitation is a by products of a two mass. but maybe the theory of relativity shows things differently.
 
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JavaMomma

Senior member
Oct 19, 2000
701
0
71
Originally posted by: jamesave
Is light considered as a mass? if not, would it be considered as something that the gravitation can pull?

all my minds still thinking that gravitation is a by products of a two mass. but maybe the theory of relativity shows things differently.
Click to expand...


I am studying for a Chemistry exam, and just finished reading about this.
You questions answer right from the book, "The answer appears to be yes."

m = E/c² = h/?c

m is the mass
E is energy
? is the wavelength
c = 2.9979x10^8 m/s (speed of light)
h = 6.626x10^-34 Js (Planck?s constant)

Foot note:
"The mass of a photon depends on its wavlength. The mass of a photon at rest is thought to be zero although we never observe it at rest."
 
Gunslinger08

Gunslinger08

Lifer
Nov 18, 2001
13,234
2
81
Originally posted by: jamesave
Is light considered as a mass? if not, would it be considered as something that the gravitation can pull?

all my minds still thinking that gravitation is a by products of a two mass. but maybe the theory of relativity shows things differently.
Click to expand...

Yes, light has mass. Light is emitted in packets of radiation known as photons. These photons act as both particles (which have mass) and waves (which you can argue have mass or not).
 
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