Gravity:general question.

That wouldn't make any difference if density was homogeneous in a body.

If you had two balloons, one filled with Oxygen and the other with Helium, the radius will be measured from the center point of each balloon. If you increase the mass of each equally, the radius of each balloon will change, but the radius between the center points will not, so the gravitational pull between the two balloons will not change.

 

Log in or Sign up to hide all adverts.

I think the most complete answer you find here.

 

Log in or Sign up to hide all adverts.

Log in or Sign up to hide all adverts.

I personally don't think so.

Yet he wasn't asking about mass. He clearly says that.

I can't take offense at that.
You may think ignorance is laudable but I do not.
I will follow my interest and not your indignation. Sorry. ( I mean no offense by that)

 

I think photons react to gravity both by producing it and by responding to it. Maybe we should do a Google search on Photonic Gravity and see what turns up.

 

Photons react to gravity by responding to it?
Is that not at least very slightly tautological?

Photons react to gravity by producing it?
Is that not at least very slightly contradictory?

 

How so?

Photons produce gravity and respond to gravity. That's just another way of saying that photons attract each other gravitationally.

I didn't invent that. It is general knowledge. Or at least it should be.

 

You didn't?

http://photontheory.com/mass.html

http://www.thenakedscientists.com/forum/index.php?topic=19990.msg342647;boardseen

 

Linguistically at the very least.
If something produces something else it isn't reacting to that something else since a reaction can only be to something that already exists. - Contradiction.

If something reacts to something then it is automatically responding. - Tautology. A reaction IS a response.

Do they? Massless particles produce gravity?

 

Correct, I did not invent it. In that link is my guess at the mechanism that might cause the well known phenomena. Photons gravitate.

Yes; and they also produce mass. Just trap some inside a mirrored box and see.

 

Then please source it.

Again, source it.

 

Are you kidding? Look in your physics book!

Here's a reviewed paper on it.

 

No, I'm not kidding. It seems to be something that wasn't mentioned when I got my physics degree 35 years ago. You've made the claim that massless photons create mass.

So source it please. (you are able too, aren't you?)

 

I didn't make the claim. I simply stated a fact that I thought everybody knew. The link above seems to confirm that it is common knowledge.

Another clue

From that link.

Edit: I didn't say MASSLESS photons create mass. I said that photons trapped in a mirrored box are mass.

Edit:

Another post from the moderator at physicsforums.com.

 

Fail, that other clue is dated after at least one of YOUR similar claims.

 

I don't understand what you mean. Are you people honestly trying to claim that photons do not gravitate?

I doubt that the moderator of that physics forum is taking clues from me.

 

Did you really mean to say “Mass doesn't have any known sub-properties”?

The reason I ask is because nobody really knows what mass is at a fundamental level. Sure it's a property of matter, but it's also a property of sub atomic particles and photons and maybe neutrinos. What is it about matter and all these particles that generates the property we call mass?

Next what is the nature of matter in a black hole, besides being highly compressed. Will we ever know? Once matter becomes black hole matter it's not likely to ever become normal matter again at least not in any meaningful time frame we can deal with. But they do the push on the limits of mass and gravity.

 

More over you are wrong in saying factually that it is the only determination of Gravitational Force. The proper answer is we can't even be for sure it is the only factor. In fact from what I gather from the wiki is that mathematically things aren't adding up concerning what we see an actual demonstration among the stars and I suppose that's where Dark matter comes in. But the point is we don't know and there does seem to be another factor.

You didn't answer this question you repeated him.

Context. He's looking for another answer other than mass.

Stop projecting. Your time will always be yours to waste I have nothing do with your decision making James.

 

This thread is getting confusing. It's my understanding that photons do indeed have mass (very little mass but still mass).

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html

Photons do react to gravity or there would not be any gravitational lensing effects. Can't be much better proof than that.

Vern your English could use a bit of improvement, but I get where your coming from.