Thread: Gravity

Ok, first piece of shrapnel for the topic.

All masses, all matter has weight, so it has gravity. Therefore, all masses have gravity, and it attracts other masses to it. The heavier the mass/matter, the larger and more significant the gravity.

We have our own gravity, and so does your computer mouse! But maths tells us that we will basically never notice the mouse moving toward you (far too minute gravity).

(So lets just focus on the gravity of the Earth/planets/stars.)

Have you ever imagined what a mess would be inside your house devoided of gravity? Forget about a pillow under your head - it would be floating somewhere in the air...

You wouldn't need a pillow! Floating in mid-air must be as comfortable as ever! I think eating would be a little more difficult...somebody got a special device to make it easier?

Originally Posted by really

You wouldn't need a pillow! Floating in mid-air must be as comfortable as ever! I think eating would be a little more difficult...somebody got a special device to make it easier?
[/b]

Not to mention sex.

Originally Posted by Rav1

Not to mention sex.
[/b]

-Would be harder to do, or easier? lol (somebody try, somebody go into space and try )

hey btw have you heard. Gravity is God. god's nothing more than gravity. it was never any other way. ever. ...Gravity is faster then light its instantaneous. AND therefore this means Nietschzseie was Wrong. as usual...

Originally Posted by Rav1

Not to mention sex.
[/b]

....

I need female volunteers.

For the sake of science.

Originally Posted by ;330249

hey btw have you heard. Gravity is God. god's nothing more than gravity. it was never any other way. ever. ...Gravity is faster then light its instantaneous. AND therefore this means Nietschzseie was Wrong. as usual...
[/b]

I read it was the speed of light - electromagnetic wave speed. Both light and gravity are thought to have electromagnetic wave properties. But scientists still don't know for sure...

gravity, w00t!

So, whats up with the fixation with zero g's.

Originally Posted by ;330249

hey btw have you heard. Gravity is God. god's nothing more than gravity. it was never any other way. ever. ...Gravity is faster then light its instantaneous. AND therefore this means Nietschzseie was Wrong. as usual...
[/b]

Nietzsche was never wrong! nietzsche was the ubermensch!

And btw he said that "god is dead" as in religion, and the institution of the church; he didn't say that there wasn't a governing force to the universe. In fact, he DID say there was a governing force; he called it WILL.

And you cannot single out gravity and call it a "ruling force,"... there are three more forces, electromagnetic, and the strong and weak nuclear forces. Yes, the universe could not exist without gravity, but neither could it exist without any of those other three forces.

So this means that umm, you were wrong?

and I think really is right. Scientists used to think gravity was instantaneous, but then proved that if the sun exploded, we wouldn't immediately fall out of orbit... I remember reading something like that in Brian Greene's book but can't remember for sure (it was a pretty boring book) so I may be wrong.

anyway, gravity is really cool. What I DO remember from his book is that he thinks that it is the influence of objects in OTHER DIMENSIONS!! thats why its so weak, even though its so powerful... a single atom has enough strong nuclear force to start a nuclear reaction, but its gravitational force is close to nill. This is because gravity is just a shadow from another dimension... according to him

gravity is confusing

I'll shut up now

allow me to insert a random smiley

Originally Posted by Tsen

....

I need female volunteers.

For the sake of science.
[/b]

lol

I have no idea what is going on in this topic. I really don't.

scientists dont know what they are talking about anymore, first they say nothing can travel faster than the speed of light, then they explore the big bang theory and eventually they came to the conclusion that when the big bang happened the atoms were dispersed across nothing at such a fast speed that they were dispersed across a patch of area the size of our solar system in 1 billionth of a second... this proves that there is no limit to nature and no closure to the arguement that science is always right...

Originally Posted by the

scientists dont know what they are talking about anymore, first they say nothing can travel faster than the speed of light, then they explore the big bang theory and eventually they came to the conclusion that when the big bang happened the atoms were dispersed across nothing at such a fast speed that they were dispersed across a patch of area the size of our solar system in 1 billionth of a second..[/b]

Actually, this makes total sense. Because it wasn't just that the particles were moving, space itself was also expanding. As space expanded, the apparent velocity of the particles moving within the space was faster than the speed of light...to an independent observer. It's like when you run up an escalator.

But anyways, who was saying that gravity is faster than the speed of light? If the sun exploded right now, we wouldn't know, visually or gravitationally, for about 8 minutes. Because that's how long it takes the 'signal' to reach us.

Anyways, the best description of gravity I've heard is as follows: Picture a big sheet of rubber, that's space. A bowling ball represents an object in space. Put the bowling ball on the sheet of rubber. What happens? A depression is created. The closer you get to the ball, the steeper the slope. Other objects accelerate down the slope.

Here's a pic.

Originally Posted by bradybaker

Here's a pic.


[/b]

Yeah it's that, only in three or more dimensions, not two... Why do scientists always show examples in 2D, is this because it is easier to understand that way?

Yeah. Really, there's far more than four dimensions, they're just really hard to comprehend, and for the most part don't matter in traditional Newtonian physics, so scientists create metaphors and analogies to make things a bit easier to grasp.

Originally Posted by bradybaker

Actually, this makes total sense. Because it wasn't just that the particles were moving, space itself was also expanding. As space expanded, the apparent velocity of the particles moving within the space was faster than the speed of light...to an independent observer. It's like when you run up an escalator.

But anyways, who was saying that gravity is faster than the speed of light? If the sun exploded right now, we wouldn't know, visually or gravitationally, for about 8 minutes. Because that's how long it takes the 'signal' to reach us.

Anyways, the best description of gravity I've heard is as follows: Picture a big sheet of rubber, that's space. A bowling ball represents an object in space. Put the bowling ball on the sheet of rubber. What happens? A depression is created. The closer you get to the ball, the steeper the slope. Other objects accelerate down the slope.

Here's a pic.


[/b]

Thats the kind of picture i was looking for before while explaining it to Onei in anouther topic

Originally Posted by bradybaker

A black hole is basiclly a star whose gravity has become so strong that it has collapsed on itself and nothing, not even light can escape it. Einsteins realativity theory explains the basics of a black hole. The escape velocity needed for particles of light is lower than the amount of gravity being put on the light. Black holes and stars' gravity also cause time dialation. Mercury is close enough to the sun to experience this and i cant rememeber exacly how, but it has somthing to do with the rotation and the speed at which we view it orbiting the sun... SO if you were to look at a star and a black hole and a planet within the plain of the universe from the top it would look like this...


But when you throw in the dialation of time in space and you look at the grid from the side it looks like this....

Time and space becomes streched and distorted due to the high gravity, the larger the mass, the higher the affect.
[/b]

Originally Posted by bradybaker

Actually, this makes total sense. Because it wasn't just that the particles were moving, space itself was also expanding. As space expanded, the apparent velocity of the particles moving within the space was faster than the speed of light...to an independent observer. It's like when you run up an escalator.

But anyways, who was saying that gravity is faster than the speed of light? If the sun exploded right now, we wouldn't know, visually or gravitationally, for about 8 minutes. Because that's how long it takes the 'signal' to reach us.

Anyways, the best description of gravity I've heard is as follows: Picture a big sheet of rubber, that's space. A bowling ball represents an object in space. Put the bowling ball on the sheet of rubber. What happens? A depression is created. The closer you get to the ball, the steeper the slope. Other objects accelerate down the slope.

Here's a pic.


[/b]

Something just occured to me when I read this post - lets see if I can explain without a diagram (my drawing skills leave a lot to be desired)... I am trying to understand the concept of expanding space causing things to apparently move faster than light.

If space was expanding then all the matter contained within it is expanding too. In a simple example consider two particles in two moments of time, in an expanding 1 dimensional universe.

There are two particles, A and B. The radius of the particles is 1. The position of the particles on a 1D line is 1 and 2.

Particle A has a position of 1, radius of 1.
Particle B has a position of 2, radius of 1.

As you can tell, in this first moment, particle A and B are touching, since they are 1 unit apart and have a radius of 1

So now, what exactly happens when the universe expands. Surely the particles will grow in size, and the distance between them will increase:

The size of the universe has doubled. Now:

Particle A has a position of 2, radius of 2
Particle B has a position of 4, radius of 2

In this second moment, the particles are still touching. Relatively, nothing has changed. Because everything has scaled up in proportion to everything else, it seems that relative to an observer inside the expanding universe, nothing would appear to change. The universe could expand and contract all the time and noone would notice because the observer will also be expanding and contracting in the same proportion... However:

Now throw velocity into the mix. Does the speed at which objects are moving also scale with the expansion of the universe? As the universe stretches, objects grow in size, but does this affect their velocity? If this is the case, the speed of light would "appear" to be decreasing as the universe expands.

Interesting thought.....I don't really know how it would fit in. I do know that some recent research has shown that the speed of light may not remain constant over time (ie. it used to be different).

Originally Posted by bradybaker

Interesting thought.....I don't really know how it would fit in. I do know that some recent research has shown that the speed of light may not remain constant over time (ie. it used to be different).
[/b]

Well its got me stroking my chin in perplexion thats for sure.

I recall readin somewhere that every force is essentially the same, if all energy types are at a high enopugh level they are all one "type" of energy. If you think about it you add an electric charge to a magnet it becomes an "electromagnet" now some may think that it is simply magnetism enforced by electric waves but is actually a completely different energy, what we have to do now is find some way to intensify gravity along with electric and magnetic to find the "main" type. Not everything has gravity, anti-matter is still matter but immune to the effects of gravity, electricity, or magnetism.

One more thought. There was a recent study that shows that black holes emit x-rays. Now the problem with that is gravity, matter wise, is non-disclusive all light travels at the same speed, so why are black holes emitting x-rays?

Mitravelus

I think that scientists need to research into electromagnetics because my idea is that the force of gravity has somekind of an electromagnetic nature.

Originally Posted by mitravelus

I recall readin somewhere that every force is essentially the same, if all energy types are at a high enopugh level they are all one "type" of energy. If you think about it you add an electric charge to a magnet it becomes an "electromagnet" now some may think that it is simply magnetism enforced by electric waves but is actually a completely different energy, what we have to do now is find some way to intensify gravity along with electric and magnetic to find the "main" type. Not everything has gravity, anti-matter is still matter but immune to the effects of gravity, electricity, or magnetism.

One more thought. There was a recent study that shows that black holes emit x-rays. Now the problem with that is gravity, matter wise, is non-disclusive all light travels at the same speed, so why are black holes emitting x-rays?

Mitravelus
[/b]

Yes, at high enough temperatures all forces merge into one another, but EXTREMELY high temperatures, like big-bang high.

Stephen Hawking researched black hole radiation... he discussed it in his book, and it is really hard to explain, but some radiation always somehow "escapes" the black hole.

imagine trying to pee in the toilet with no gravity