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Clocks are not a natural phenomenon. What they measure (by our input alone) is duration of an event (motion). Motion is change, and change comes in all sorts of lengths of duration. A duration has a beginning and an end and its length is determined by the beginning and the end, and thus we derive our measure of time by the observance of the length of a duration.
Differences between gravitational and electromagnetic radiation
So far we have been emphasizing how, at a fundamental level, the generation and propagation of gravitational and electromagnetic radiation are basically quite similar. This is a major point in demystifying gravitational waves. But, on a more practical level, gravitational and electromagnetic waves are quite different: we see and use electromagnetic waves every day, while we have yet to make a confirmed direct detection of gravitational waves (which is why they seemed so mysterious in the first place).
There are two principal differences between gravity and electromagnetism, each with its own set of consequences for the nature and information content of its radiation, as described below.
Gravity is a weak force, but has only one sign of charge.
Electromagnetism is much stronger, but comes in two opposing signs of charge.
This is the most significant difference between gravity and electromagnetism, and is the main reason why we perceive these two phenomena so differently. It has several immediate consequences:
Significant gravitational fields are generated by accumulating bulk concentrations of matter. Electromagnetic fields are generated by slight imbalances caused by small (often microscopic) separations of charge.
Gravitational waves, similarly, are generated by the bulk motion of large masses, and will have wavelengths much longer than the objects themselves. Electromagnetic waves, meanwhile, are typically generated by small movements of charge pairs within objects, and have wavelengths much smaller than the objects themselves.
Gravitational waves are weakly interacting, making them extraordinarily difficult to detect; at the same time, they can travel unhindered through intervening matter of any density or composition. Electromagnetic waves are strongly interacting with normal matter, making them easy to detect; but they are readily absorbed or scattered by intervening matter.
Gravitational waves give holistic, sound-like information about the overall motions and vibrations of objects. Electromagnetic waves give images representing the aggregate properties of microscopic charges at the surfaces of objects.
Gravitational waves, similarly, are generated by the bulk motion of large masses...
originally posted by: Kashai
a reply to: Kashai
One way to understand what is explained is that in so far as Gravity having only one charge presents that Anti- Gravity is impossible.
Sure we can find alternative way to leave a planet but that is not anti-gravity which in scope would be like the direct opposite of gravity in translation.
Such a potential in reality does not exist as far as we know.
originally posted by: greenreflections
a reply to: Kashai
Hi there,
Gravitational waves, similarly, are generated by the bulk motion of large masses...
I just don't buy it. It is pretty lame as an explanation...Can you please elaborate on this a little more?
...and how Moon orbits Earth. What keeps it in orbit and why things fall down toward mass at the same acceleration rate since motion of gravity generator can be different, but the speed at which smaller objects fall toward source of gravity is the same regardless of the mass or size of smaller object (feather and a hammer)?
cheers)
You're not making much sense to me talking about space having content.
originally posted by: elysiumfire
What is space? We can only infer an answer to this question by showing what space is not. Can we agree on the following proposition? The universe has two aspects to it, the first being space itself, and the second aspect is that some or all of space has content in it. Space cannot be contained by itself, space contains content.
You can measure the 30 meters yourself, maybe it's not exactly 30 meters but it's measurable. When the air is still in it I wouldn't call it space but after the air is pumped out I'm OK with calling that 30 meters diameter "space".
originally posted by: KrzYma
a reply to: elysiumfire
EXACTLY !!!
Measuring and counting is how science works, or was working...
Measuring and counting of what is already present.
Then they came up with Spacetime, Black Holes, Dark Matter and what not else to fit the failing theories.
The space inside contains air before it's evacuated, but after the air is evacuated, what's left? Space.
Sure, but your point was it couldn't be measured. My point is it can be measured, it's 30 meters across in that vacuum chamber, so there's your measurement, 30 meters. You can measure other properties of space like travel time of light, that's how we know the moon is slowly moving away from the Earth, bouncing a laser between them to measure the space in between them, so again, space can be measured.
originally posted by: KrzYma
This 30m of created airless space is inside something else, isn't it ??
You're using very unsophisticated terminology apparently in a poor attempt to talk about relativity, but at the heart relativity makes mathematical predictions about how mass affects the space around it, and those predictions have been confirmed experimentally. If you don't like calling it bending or stretching call it something else, but the predictions are confirmed so far and there have been many confirmation experiments.
you can not bend or stretch space
The engineers who designed the GPS system included these relativistic effects when they designed and deployed the system. For example, to counteract the General Relativistic effect once on orbit, they slowed down the ticking frequency of the atomic clocks before they were launched so that once they were in their proper orbit stations their clocks would appear to tick at the correct rate as compared to the reference atomic clocks at the GPS ground stations. Further, each GPS receiver has built into it a microcomputer that, in addition to performing the calculation of position using 3D trilateration, will also compute any additional special relativistic timing calculations required [3].
Relativity is not just some abstract mathematical theory: understanding it is absolutely essential for our global navigation system to work properly!
Sure, but your point was it couldn't be measured. My point is it can be measured,
If you don't like calling it bending or stretching call it something else, but the predictions are confirmed so far and there have been many confirmation experiments.
It's not my fault you've never posted any model that makes quantitative predictions for others to evaluate. If you have one, then post it and eliminate the confusion, that's on you not on me.
originally posted by: KrzYma
Again, like in any other thread we talk about something, you change what I'm saying into something else...
Again you've provided no quantitative model to fully explain what this is supposed to mean, but if I try to interpret it, it suggests to me that you think light slows down in an electric field because + charge and - charge give two electric fields and that's what makes light slow down. Then it sounds like according to this model light should slow down in an electric field and I've never seen any experiments suggesting that it does and we can measure the speed of light quite accurately now. Also without your equations to show precisely how much light is supposed to slow down in what electric field strength I don't even have sufficient parameters to test your idea.
I know you and others think charge +1 and charge -1 results in charge 0 and that's it for you, like the electric field would disappear... NO, it does NOT disappear!!
I told you in another thread already this
+1 charge and -1 charge is 2 charge density with 0 sign.
Denser field makes light travel at slower speed and the gradient of the field "bends the light"
To understand this you need to go away from point like photon construct and see electro-magnetic waves like they are,
they have a real size, they have begin & and, they are 3 dimensional, E and B.