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originally posted by: wildespace
originally posted by: rockintitz
a reply to: Xeven
Space is just that, space. As close to nothingness as you can get.
And yet, the absolute nothingness doesn't exist, and space is actually a "something" that can be bent, has some intrinsic energy, and can give rise to particles. In fact, the Big Bang and our whole existence could be due to false vaccum decaying to a lower energy state.
For the poster of this thread (and for everybody else), you might be interested in reading about the Casimir effect, which is a pushing force exerted by vaccum, thanks to quantum fluctuations of vacuum energy. In fact, I believe that the expansion of the universe is due to this effect.
Speaking of space and gravity, you must not forget the "time" component of space-time. Gravity not only bends space, but also slows the local time down. Standing on a very massive planet, you would age slower than the guy who lives on an asteroid.
As a bonus to all these tidbits of information, here's my video that illustrates how mass and gravity bends space - shown in 3D rather than with that lame and innacurate "trampoline" analogy:
www.youtube.com...
originally posted by: Xeven
So gravity is basically the result of interaction between space and matter? Space is really gravity if you are matter?
originally posted by: TheRedneck
So in summary, everything is energy in spacetime.
originally posted by: TheRedneck
originally posted by: Xeven
So gravity is basically the result of interaction between space and matter? Space is really gravity if you are matter?
Gravity is movement of spacetime. That's about as simple as it gets.
All matter exerts a force on spacetime, which is essentially energy. This force leads to a type of gravitational 'current' that results in an overall attraction between two masses. This is typically represented as a 'bending' of spacetime for sake of simplicity. At the same time, matter itself is also energy (E=mc^2) but it is energy that has somehow become trapped in spacetime. I believe this to be the result of a standing wave equation, the stable frequency of which would be determined by the resonance of spacetime.
Planck's Constant also equates energy to frequency (E=hf) or wavelength. That means hf=mc^2, or that all energy has a mass equivalent. This mass equivalent is typically so small, however, that we have not yet been able to measure it (to the best of my knowledge). Even frequencies as high as light frequencies are orders of magnitude less than that of, say, a proton. I ran some calcs some years ago that indicated the measured size of subatomic particles were predictable from a multiple of their energy-equivalent wavelength. Unfortunately, those calcs are locked up in an old, dead, hard drive.
So in summary, everything is energy in spacetime. Matter is 'trapped' energy embedded in spacetime; gravity is an inward movement of spacetime created by matter. This causes us to observe gravity as an attraction between mass.
TheRedneck
originally posted by: burgerbuddy
a reply to: Xeven
traveling through space, without time
originally posted by: wildespace
originally posted by: burgerbuddy
a reply to: Xeven
traveling through space, without time
Now you're describing travelling at the speed of light. When you travel at the speed of light, your time doesn't just slow down, it stops completely. So, any such travel will be instantaneous for you.
It's all described in Einstein's Special Relativity.
Weirder things happen when you (purely hypothetically) consider travelling at faster than light speed. The equation for time dilation uses a square root of a variable that approaches zero as you appearch light speed. At faster than light speed, this variable would have to be a negative number, and you can't have a real number as the square root of a negative number. That means you'd have to use imaginary numbers, implying that time, for you, would also become "imaginary". Perhaps, that would mean that you would wink out of this universe and its time flow and pop out in some parallel universe or parallel time.
Getting a slight attraction to the nearest wall is apparently what proponents of the "hollow Earth hypothesis" think would happen, but according to our models of physics, that's not what would happen inside a uniform spherical shell, as explained here:
originally posted by: chr0naut
Also, in the Earth's core scenario, you'd float as all the forces would oppose in balance. If you moved closer to a wall, however, you'd not be on centre anymore, you'd disturb the balance and you'd get a slight attraction to the nearest wall.
The net gravitational force on a mass m anywhere inside a uniform spherical shell of mass M is zero!
Photons travel at Warp factor 1.0, the speed of light.
originally posted by: Xeven
Do light photons travel in warps?
True, with some definitions of zero-g, or as they sometimes call it on the ISS, microgravity, where the gravity from Earth is maybe 0.9g so much closer to 1g than 0g. With other definitions of zero g the 0.9g on the ISS is called "zero-G". The usage of terminology can be a little confusing sometimes, since I've heard people refer to "zero-G" or "microgravity" aboard the ISS where gravity is not really zero. This video tries to explain the confusing terminology:
originally posted by: dragonridr
There is no point in the earth with zero g. The earth itself is in motion and as such will always create a force see above.
The condition of microgravity comes about whenever an object is in free fall.