SPACE

 Space is something, and there is a lot of it. In the older days, people probably didn't realize that air exists. There still are people who think that air is like nothing, being some kind of gas that weighs nothing, has no pressure, and such. Yes; wind, wind is something. That's like fish who don't realize that there is water all around them. "Water? Where?". One cube of space Start with a cube of 1x1x1 meter, full of water. Then take out all the water. Is the cube empty now? No. Now there is air in it. It got in there while the water went out. Now take out all the air. While doing so, one will discover that the atmosphere we live in, is pressurized. The pressure is more than 1kg of force on each cm2, that's more than 10000kg on each of the 6 sides! But we struggle and overcome, to in the end have a cube free of air. Is the cube empty now? It is a 'vacuum', a space without atoms. Yes, but is the cube empty now? Sound waves can't travel through this vacuum, because sound needs an atomic medium to travel through, such as: pressurized air, or a solid object. But radio waves can still travel through this vacuum, so it seems logic that there still is some kind of non-atommic medium present. The force of gravity, whatever that may be, is also present in this vacuum. The area of 1 cubic meter is still here. If we had removed everything, the area would be gone. Conclusion: a room doesn't disappear when all atoms are removed from it. Space doesn't start outside the Earth; it is everywhere. Atoms and such are probably structures that are made out of this space material and energy (energy... what is that?!). Could vacuum space be kind of similar to air: a pressurized fluid? Or is the fabric of space a structure that can be bent, but does not flow, similar to say gelatin pudding? Atoms, Acceleration and Gravity, in space. Imagine 1 tomato in a completely empty space. No stars, no dust, no light, nothing else other than that tomato. What is its speed? There is no way to tell, because speed is always relative to something else, but there is nothing else and it seems impossible to have a speed relative to space. Now imagine a second tomato. It is not so far away, and the distance between them is changing. Both now have a speed, relative to the other. But who is moving? A) tomato #1 is moving. B) tomato #2 is moving. C) both tomatos are moving. D) non of them are moving. How could D be true? It makes no sense. Well; the only thing that seems clear is that the distance in between the two tomatos is changing, so maybe its only the space in between that is moving. When you're inside a closed box, there is no way to tell if you are moving at a constant speed or not moving at all. You can't feel it, nor measure it with instruments. What you can feel and measure is: acceleration. When you're inside that box and feel the force of acceleration; things have weight. Your instruments tell you there is an acceleration of 1G. What could be the case? A) The box is standing on the surface of the Earth. B) The box is in space and accelerating towards Mars. C) The box is in space and de-accelerating near Mars. All three could be true. There is no way to distinguish which is the case. One thing is sure: there is no difference between accelerating and de-accelerating. That's just the same thing in the opposite direction. But there may also be no difference between acceleration and gravity. One more box example: you don't experience any acceleration? Don't conclude there is nothing going on. You may be orbiting around a planet, or falling down to it faster and faster. It's weird how stuff (atom based bodies) travels through vacuum space, especially relative to what we are used to on the surface of the Earth; air-resistance and 1G gravity. Stuff resists against acceleration. "Inertia" What is that exactly? Stuff traveling though vacuum space at a constant speed is not slow down by 'space-resistance'. If there would be space-resistance, everything would accelerate down to a speed of zero, relative to the fabric of space and everything in it. But that is clearly not the case. Light in Space. The speed of sound in standard air is about 343 meters per second. That is pretty fast, but you know from experience that sound comming from far away takes longer to reach you than light. Lightning and thunder for example. The speed of light in a vacuum goes a little bit faster: 299,792,458 meters per second! But wait a second... The speed of sound is relative to the medium it is traveling through. To what do we measure the speed of light? Relative to the fabric of space seems impossible. Are we talking about relative to the position where the photon was created? How do we know what an absolute position and what an absolute distance of 299,792,458 meters is? And how do we know how long one second takes? Are distance and time absolute constants? It seems that nothing can propagate faster than a photon. How does a photon move though? What structure does it have? It has a wave length, so I guess it either vibrates or rotates. If there is motion inside a photon, and its average speed is the speed of light, then parts of it go slower than light, and the other parts go faster than light, especially if the internal alternating motion is in the direction of travel. One photon travels straight through space. Not like a wave on water or a sound wave in air. Though when light passes through a part of space were there's a lot of gravity, it's path can curve a bit. Gravity slows down light, that has been proven. I can't go faster than light? Really? But I don't know what my speed is. Relative to what? If I had a rocket with an unlimited propulsion system and accelerate in one direction for 1000 years, and then stop the thrust, what is my speed then? I don't know now and I won't know then. My speed relative to what? Speed is relative, and can't be relative to space. If there is no 'eather', there can't be a speed limit. Right?

 The limits of our imagination. Most of what we experience in our personal virtual reality (in our brains), is just a tiny reflection of the truth. The ideas we have about: vacuum space, gravity, time, distance and such, may still be far from the optimal reflection. Distance Inertia Entanglement Wow; my head is spinning. I still don't know what space is.

 Giesbert