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Originally posted by mnemeth1
Originally posted by -PLB-
reply to post by mnemeth1
How would the orbit be different with different speeds of gravity? The involved forces would be the same, just delayed, so I don't see how it would matter.
The Earth would go flying off into deep space within 1200 years if gravity did not propagate faster than light. This is because the Sun itself is moving.
Given that there is an 8 minute time delay between when light leaves the Sun and when it arrives at Earth, if gravity moved at the speed of light, the Earth's orbit would rapidly destabilize.
[edit on 20-5-2010 by mnemeth1]
Originally posted by -PLB-
But it doesn't make sense to me. I found that the gravity of the sun on the earth is 0.006m/s^2. This is constant over time. So currently this gravity is 0.006m/s^2 but 8 minutes ago this gravity was also 0.006m/s^2. Since this seems the only relevant force for the earth to be in orbit, I don't see how we would be flying away. It would just mean we orbit the sun as if it were in the position it was 8 minutes ago. But what does that matter? It only means we lag a bit, but we follow exactly the same trajectory.
Originally posted by mnemeth1
Gravity itself is an infinitely weak force.
Its so weak that there is no possible way to account for the Earth's orbit unless we assume it propagates at an infinite speed
Originally posted by buddhasystem
Rarely have I seen such inane statements as they apply to physics. I suggest you go step out of the window of a tall building to ascertain your hypothesis.
Originally posted by buddhasystem
What does speed have to do with force? Hint: nothing.
Originally posted by mnemeth1
How do physicists calculate the orbit of the earth?
Do they use infinite speed G or not?
In astronomy, a barycenter is the center of mass of two or more celestial bodies that orbit each other, or the point at which the objects are balanced. When an object is traditionally thought of as orbiting another, such as the Moon orbiting the Earth or the Earth orbiting the Sun, the center of orbit is virtually never at the direct center of the more massive body. Rather, both objects are orbiting the same point, the barycenter, that may lie more or less off center within the more massive body.
Expressed less technically by Sir Arthur Eddington, this means: “If the Sun attracts Jupiter towards its present position S, and Jupiter attracts the Sun towards its present position J, the two forces are in the same line and balance. But if the Sun attracts Jupiter toward its previous position S’, and Jupiter attracts the Sun towards its previous position J’, when the force of attraction started out to cross the gulf, then the two forces give a couple. This couple will tend to increase the angular momentum of the system, and, acting cumulatively, will soon cause an appreciable change of period, disagreeing with observations if the speed is at all comparable with that of light.” (Eddington, 1920, p. 94) See Figure 1.
In concluding this section, we should also note that, even in the solar system, the Sun moves around the barycenter in a path that often takes the barycenter a million kilometers or so from the Sun. So the idea that the Sun’s field can be treated as “static” and unchanging is not a good approximation even for our own planetary system.
Originally posted by mnemeth1
Originally posted by buddhasystem
Rarely have I seen such inane statements as they apply to physics. I suggest you go step out of the window of a tall building to ascertain your hypothesis.
You disagree that gravity is an infinitely weak force?
We have the entire mass of the Earth pulling down on us right now, yet I can jump off the ground under my own power.
That's a pretty weak force.
Originally posted by buddhasystem
Before you even venture to post on science subjects, study the vocabulary. In the very least, the "infinitely small" means it can be safely neglected within the limits of the problem being considered. Again, I invite you to sky dive without a parachute to ascertain this.
Originally posted by mnemeth1
Think about it.
The Sun is moving through the Milky Way at 486,000 miles per hour.
That's pretty fast.
If gravity propagated at the speed of light, in 8 minutes of delay, the Sun would have moved 64,800 miles before the Earth realized where the Sun was now at.
Originally posted by mnemeth1
Originally posted by -PLB-
reply to post by mnemeth1
How would the orbit be different with different speeds of gravity? The involved forces would be the same, just delayed, so I don't see how it would matter.
The Earth would go flying off into deep space within 1200 years if gravity did not propagate faster than light. This is because the Sun itself is moving.
Given that there is an 8 minute time delay between when light leaves the Sun and when it arrives at Earth, if gravity moved at the speed of light, the Earth's orbit would rapidly destabilize.
[edit on 20-5-2010 by mnemeth1]
A common way to explain why gravity can appear to act instantaneously, yet still propagate with a delay, is the rubber sheet analogy (See cover illustration--top of page). A large mass sitting on a rubber sheet would make a large indentation, and that indentation would induce smaller nearby masses to role toward the indentation. This is an analogy for curved Space-Time, which is likewise supposed to be the cause of bodies accelerating toward large masses. The reasoning in the analogy further suggests that target bodies simply respond instantly to the local curvature of the underlying Space-Time medium (like the rubber sheet). Therefore, any delay associated with altering that local curvature would not produce aberration, and the target body would appear to respond instantaneously to the source unless the source suddenly changed its motion.
The rubber sheet analogy is represented as a way of visualizing why bodies attract one another. However, in that regard, it is highly defective. A target body sitting on the side of an indentation would stay in place, with no tendency to roll downhill, unless there were already a force such as gravity underneath the rubber sheet pulling everything downhill.
The planets orbit the sun at approximately 45 degrees wrt the direction of the solar system’s galactic orbital motion, as evidenced by the angle the band of the milky way makes in the night sky, remembering the Earth is inclined a further 23.5 degrees to the invariant plane (the average of the planetary orbital planes). It is thought that this tilt is necessary in order to maintain the conservation of angular momentum as the solar system moves in it’s orbital path round the galaxy.
Originally posted by mnemeth1
Originally posted by buddhasystem
Before you even venture to post on science subjects, study the vocabulary. In the very least, the "infinitely small" means it can be safely neglected within the limits of the problem being considered. Again, I invite you to sky dive without a parachute to ascertain this.
You mean like in SR, where gravity is totally ignored?
Originally posted by mnemeth1
My own personal thoughts on this subject, the following is my speculative take on what we have observed:
Gravity must in some way be related to electromagnetic forces.
This is the only logical conclusion, given that planets are observed to orbit on the ecliptic plane.
I believe in the electric sun and electric universe models of galaxy formation. It is not a coincidence that the plasma torus of the Sun is located along the ecliptic plane. There are no gravitational explanations for why the Sun should even have a torus in the first place, let alone why planets should orbit around it. There are no gravitational explanations for why the Phoebe ring of Saturn is located on the ecliptic rather than around Saturn’s torus where the rest of the rings are.
Electromagnetic forces are the only way to explain the rotational velocities and flatness of galaxies without resorting to hypothetical forms of matter and energy. I do not believe in any form of force or matter than can not be experimentally demonstrated.
Gravity as a force is most likely some form of a torsion wave. Matter must be interconnected and aware of all other matter near instantaneously for gravity to act like it does. A torsion wave is the only plausible mechanism to explain apparent superluminal speeds of gravity. There is no other wave function that can propagate at apparent superluminal speeds. Imagine a piece of steel rebar stretching from the Earth to the Sun. If one were to twist that bar, a person standing on the Sun would see the bar turn at the exact same moment in time as the person on Earth without any apparent delay of propagation.
The universe must be steady in state, infinite in size, and have a universal frame of reference. This is the only plausible form of the universe that eliminates all possible paradoxes. Time is not a part of space; it must arise from matter. Matter is a standing wave function itself; therefore time comes from the apparent speed of matter’s wave oscillations.
How the torsion properties of gravity are related to the electromagnetic force is still a mystery to me, but it seems apparent to me there is a relationship. Matter clearly demonstrates an interconnectedness that is superluminal. Only a wave function can explain gravity. Waves must have a medium to propagate through. Therefore there must be an aether capable of supporting standing waves and torsion waves.
Originally posted by mnemeth1
reply to post by buddhasystem
You're only lashing out at me because you're mad at yourself.
Originally posted by -PLB-
This would only be so if the stiffness of material is infinite.
Originally posted by -PLB-
Aren't you introducing invisible and unmeasurable concepts here? I am not saying that is bad per se, but isn't that your criticism against the science based on Einsteins theories?