Oh, nuts. Yeah, sorry about that. Photons is what I intended, even I have a comprehensive understanding of something as simple as photons...Eukaryote said:
*facepalm*
yes, photons must have a negligible, but still present mass.
Physics question
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*facepalm*
yes, photons must have a negligible, but still present mass.
Have done, I've had it before where I find 13 messages correcting me on something where I've admitted I know next to nothing about the subject. All of that was half remembered from TV.zeldakong64 said:
God, I would have thought the sheer amount of nerd per square meter around these parts would mean people who like and/or understand science... guess not.
Apart from the explanation with space bending around a large mass (and what's larger than a black hole, which is most definitely not anti-matter and even if it were, anti matter does not have negative mass!), photons do not have rest mass. That's the mass a body has when it's not moving.
You see, energy and mass are the same thing. When you're not moving, you just have mass, that is rest mass. When you start moving at speed s, you gain energy, that is kinetic energy. And since energy is the same as mass, that means that moving increases your mass (via energy).
So basically jogging makes you fatter.
Well, not really, don't sweat! Since when you stop you lose the kinetic energy, you go back to your rest mass. It's the same with photons, except their rest mass is zero. However, since they move at the speed of light, they actually have quite a bit of energy, which is equivalent to mass through the formula E = mc².
Apart from the explanation with space bending around a large mass (and what's larger than a black hole, which is most definitely not anti-matter and even if it were, anti matter does not have negative mass!), photons do not have rest mass. That's the mass a body has when it's not moving.
You see, energy and mass are the same thing. When you're not moving, you just have mass, that is rest mass. When you start moving at speed s, you gain energy, that is kinetic energy. And since energy is the same as mass, that means that moving increases your mass (via energy).
So basically jogging makes you fatter.
Well, not really, don't sweat! Since when you stop you lose the kinetic energy, you go back to your rest mass. It's the same with photons, except their rest mass is zero. However, since they move at the speed of light, they actually have quite a bit of energy, which is equivalent to mass through the formula E = mc².
This man here has the correct answer. The nature of all masses is that particles (since light has a dual nature, it still falls under this principle) tend toward objects with mass, because a mass in spacetime bends space itself (and also time, since time is merely another aspect of space, hence the "4th dimension"). This bend distorts the curvature of space, like a peice of paper being bent. And, because all EMR (Electromagnetic radiation) travels in a straight line along the curvature of space, it too is deformed. This occurs with all objects of mass, but the degree of bending scales (I don't remember if it's a slow linear or a true exponential) with respect to the size of the mass in question.Axioma said:
As such, it is possible for an object to be so massive, and thus the curve in spacetime so great, that the path of light traveling sufficiently close to this mass would be distorted to the point that it could no longer escape. These objects, massive singularities theorized to be formed by collapsed stars, are called black holes.
Pardon my wall of text, but as a Physics major, it's so rare that I actually get to use what I'm studying in common discussion. So rare, in fact, that I tend to ramble given the opportunity.
Gravity is the bending of time and space by the presence of matter. So can a black hole bend time? Yes but so does the toast you eat in the morning.HardRockSamurai said:
And @ Ekonk
No actually radiation doesn't escape black holes. (Light is a type of radiation)
The only way to detect a black hole is if there is either something behind it like a gas cloud that makes it obvious or a special trail from gatherings of physical matter (again usually a gas cloud) that identifies it as being there.
Same.LockeDown said:
As said before, light is radiation so it's no different. Black Holes are theorized to emit Hawking radiation, but it's a complicated process where a pair of entangled photons spontaneously appear at the event horizon (I think).Ekonk said:
The light or rather photons are not directly affected by gravity. However, the gravity bends space-time. In a black hole's event horizon the space is being stretched inwards so fast that the light does not have enough momentum to overtake it.Spacewolf said:
It's almost like running up an escalator, your speed remains as you run up it but the ground is moving backwards. If the escalator is too fast or even equal speed to you then you will never make it to the top.
Einstein discovered that Energy and Mass are very much related. If a particle starts moving, it gains mass due to its increase in energy. Light has no mass, but it has energy. Light isn't affected when it's in a relavitely weak gravitational field like Earth's. You get to the strength of a black-hole however, and the pull is strong enough to pull you in.
Also, the closer you go to the speed of light, the slower time advances around you. The problem is that nothing can travel at the speed of light except for light (and the rest of the electromagnetic spectrum) because nothing that has mass can travel at the speed of light, as it requires too much energy, which increases the mass. Light is a form that has all its mass in the form of energy.
Also, the closer you go to the speed of light, the slower time advances around you. The problem is that nothing can travel at the speed of light except for light (and the rest of the electromagnetic spectrum) because nothing that has mass can travel at the speed of light, as it requires too much energy, which increases the mass. Light is a form that has all its mass in the form of energy.
Black holes probably don't alter time. The "temporal displacement" we are able to see in the light, when in fact it is the massive gravity altering our perception of objects made visable by said light. Black holes have no greater gravametric pull then a regular star (of the same size as the original), astronomers have found planets in stable orbits around super-dense bodies (Neutron stars and black holes).
As for them sucking in light, I chalk it up to wizards and/or the devil.
As for them sucking in light, I chalk it up to wizards and/or the devil.
You're thinking that light is affected by gravity directly but it is not. What is happenning is that the gravity is bending space-time.j0z said:
From inside the event horizon the light is not travelling fast enough to escape the rate at which space is being stretched by the black hole. Moreover, time is also warped, so what the observer (in the case light) would experience as seconds inside the event horizon would be millennia to us.
