Science!! Fucking magnets, how do they work?

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Phazael

Phazael

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valishar_sl said:
Long answer:Does Gravity Travel at the Speed of Light?

Short answer: Relativity predicts gravity propagates at the speed of light. It hasn't been experimentally confirmed though.
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The basic principle of gravity is that it acts across infinite distances, but smaller masses over farther distances are weaker and overcome by other forces (and apparently, dark energy). The issue is that it is a constant force, so unless someone can spontaneously create matter in a closed environment, it is going to be fairly difficult to determine if the effects of gravity are limited to C by relativity. There is also the big issue of what happens when gravity is so intense that the acceleration of gravity is effectively greater than C. Those two factors lead me to believe that gravity is most likely not limited by relativity and more likely some underlying universal force, but trying to confirm any of that is basically impossible by current science, mainly because there is no such thing as a closed system when it comes to gravity.
 
T

Troll_sl

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I do particularly like the brane theory description of gravity. That it's diffused between multidimensional layers and so we only feel small effects. If that were the case, it would be possible for gravity to be unlimited by c.

And I forgot what else I was going to say because the dog is humping the cat.
 
Lanx

Lanx

<Prior Amod>
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Lejina_sl said:
Dogs don't see in grey. They are color blind, pretty much just like you really. Nearly all mammals have only two types of cones, due to our common ancestor being nocturnal shrews. Birds all have four because their dinosaur ancestors were daylight dwellers. Apes developed a mutation at some point granting them an extra cone type, making them outliers among mammals. btw, due to the location on the X chromosome, men are much more likely to be color blind due to a lack of redundancy and some rare women actually have 4 cone types.
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Yea if you're a woman, you done fucked up the colorblind lottery. (8% men, .5 women are the stats for red/green usually)
 
Furry

Furry

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Phazael_sl said:
Those two factors lead me to believe that gravity is most likely not limited by relativity and more likely some underlying universal force.
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From the 1400s to the early 1900s scientists considered it 'apparent' that gravity was a force of infinite speed. It's very very easy to see that it must act at infinite speeds or at the very minimum many factors higher than C due to the fact that the solar system flies apart if you attempt to put a delay in the speed of gravity. What happened around the turn of the 20th century is they discovered they could make only have the apparent CHANGES in gravity propagate at the speed of light. This theory thus, fails to explain real world situations.

1. The gravitational effect of objects rotating. You say this field exists, how do you explain that it both rotates and extends infinitely far. Before very long the field would have to exceed C.

2. Objects are constantly undergoing acceleration- The gravitational pull on the inside and outside are different- this can actually cause very slight changes in objects over extremely long times. How do you seriously claim that objects in gravitational fields aren't being effected, how do you justify the fact that these gravitational fields do not warp in shape?

3. If you consider the gravitational field a thing in of itself, what exactly in each point of its existence gives space this memory?

What we really need to do is make a much better gravitational anomaly map of the sun, so we can better calculate how anomalous newtonian gravity even is. At the moment it appears to be anomalous, but we do have to understand that the difference is extremely small and our information is not quite sufficient to make a perfect calculation of what it should be, yet alone what our error is.
 
Ambiturner

Ambiturner

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Phazael_sl said:
The basic principle of gravity is that it acts across infinite distances, but smaller masses over farther distances are weaker and overcome by other forces (and apparently, dark energy). The issue is that it is a constant force, so unless someone can spontaneously create matter in a closed environment, it is going to be fairly difficult to determine if the effects of gravity are limited to C by relativity. There is also the big issue of what happens when gravity is so intense that the acceleration of gravity is effectively greater than C.
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What leads you to believe the intensity of gravity would have any effect on the speed in which it propagates?
 
Drakurii

Drakurii

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NASA Scientists recreate Building Blocks of Life by simulating Outer Space Environment - Clarksville, TN Online

NASA scientists studying the origin of life have reproduced uracil, cytosine, and thymine, three key components of our hereditary material, in the laboratory. They discovered that an ice sample containing pyrimidine exposed to ultraviolet radiation under space-like conditions produces these essential ingredients of life.

"We have demonstrated for the first time that we can make uracil, cytosine, and thymine, all three components of RNA and DNA, non-biologically in a laboratory under conditions found in space," said Michel Nuevo, research scientist at NASA's Ames Research Center, Moffett Field, California. "We are showing that these laboratory processes, which simulate conditions in outer space, can make several fundamental building blocks used by living organisms on Earth."
 
Furry

Furry

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Troll_sl said:
Oh look, we're doing more experiments with quantum teleportation! Now we can send two-state systems. Too bad none of this is proven experimentally though, or else this experiment would be pretty exciting. Nope. No experiments here. Nosiree!

Two quantum properties teleported together for first time - physicsworld.com
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I don't have time to truly disassemble this article atm, and won't for a couple days sadly.

Why does it fail to meet the level of a scientific discovery? The first and most obvious answer is the detection level is far too low. The most shady part of the scientific process they follow was when they estimated their photon levels emitted per pulse. They used no justification or explanation for why that was the proper estimate, and they probably loaded their results. That said, as much as they did that, their results fall short of a scientific discovery for the exact same reason as the last paper I read. The fair sampling loophole is completely open on this experiment, and since it deals with pairs, the math is rotationally invariant, either one of those alone would be enough to completely invalidate the experiment. On top of that, their detection rates are outside of classical, but not outside of what would be expected if malus's law were applied... and they're using filters to polarize their light...

Surely 4 reasons to invalidate the experiment are fine, but hey, their 'error budget' is they so eloquently put it isn't that big a problem!
 
Cad

Cad

scientia potentia est
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Troll_sl said:
Someone please tell me his response was as rambling as I hope. I have him on ignore.
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Either he's a scientist that can find an experiment invalid on 5 minutes reading and use words that I don't even know what they mean to criticize it, or he's a rambling douche that makes shit up on the fly.
 
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