Space Vacuumm

"Whether the friction of the heavens makes a sound or no:

Every sound is caused by the air striking a dense body, and if it is made by two heavy bodies on with another it is by means of the air that surrounds them; and this friction wears away the bodies that are rubbed. It would follow therefore that the heavens in their friction not having air between them would not produce sound. Had however this friction really existed, in the many centurie that these heavens have revolved they would have been consumed by their own immense speed of every day. And if they made a sound it would not be able to spread, because the sound of the percussion made underneath the water is but little heard and it would have heard even less or not at all in the case of dense bodies. Further in the case of smooth bodies the friction does not create sound, and it would happen in similar manner that there would be no sound in the contact or friction of the heavens. And ifthese heavens are not smooth at the contact of their it follows that they are full of lumps and rough, and therefore their contact is not continuous, and if this is the case the vacuum is produced, which it has been concluded does not exist in nature.

We arrive therefore at the conclusion that the friction would have rubbed away the boundaries of each heaven, and in the proportion as its movement is swifter towards the centre than at the poles; and then there would not be friction any more, and the sound would cease, and the dancers would stop, except that the heavens were turning one to the east and the other to the north." - Da Vinci from over 500 years ago

Today we know:

"Sound travels in waves like light or heat does, but unlike them, sound travels by making molecules vibrate. So, in order for sound to travel, there has to be something with molecules for it to travel through. On Earth, sound travels to your ears by vibrating air molecules. In deep space, the large empty areas between stars and planets, there are no molecules to vibrate. There is no sound there."

Da Vinci was also one of the first, if not the first, to speculate about friction.

I didn't know that anyone knew what a "Vacuum" was that long ago, but apparently they had been speculating about it since the times of Plato. But back then they didn't consider it possible saying; "How can 'nothing' be something?" And it seems that statement still stands since a 'perfect vacuum' is only theoretical and hasn't been demonstrated.

  • "Perfect vacuum is an ideal state that cannot be obtained in a laboratory, nor can it be found or obtained anywhere else in the universe, apart from possibly the singularity of a black hole, or the (potentially large) spaces between atoms in lesser vacuums."

The amazing thing to me, other than Da Vinci figuring out there was no sound in space, is that people even comprehended or knew of a thing called "Vacuum." I mean was someone sitting around one day and all of the sudden thought; you know what I bet there isn't air way up there? I can't imagine how someone could imagine that there would be anything but air? Since no one (Supposedly) had flown yet, especially high enough to leave orbit. How could anyone think that the space between the planets and stars wasn't just air?

This was a time when some people thought that the sun was as big as it appears - meaning that it's a couple inches across. That the earth was the center of the universe etc.

Thinking about the possibility of a vacuum personally.. I come to the same conundrum Plato did "How can nothing be something?" If you imagine that you take all of the air out of an area and create a vacuum, what is left inside that area? Since they can't completely take everything out of that area to create a perfect vacuum, then what's between the pieces of matter that are still there?

  • "In everyday usage, vacuum is a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure.[1] The word comes from the Latin term for "empty," but in reality, no volume of space can ever be perfectly empty"

If you imagine a bubble rising to the surface in watter, it's air (gas molecules) surrounded by water molecules. And then in a vacuum there would still be two things. The matter/air molecules left behind, and X. X being what's left inside an area that's a vacuum. Space?

  • "The concept of space is considered to be of fundamental importance to an understanding of the physical universe although disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework."

So it seems that there is some debate about what this "Space" really is. Where there is no air or something filling a particular space - what is there instead? Is it still there when there is air also there? Is it a substance, tangible? Measurable? Or is it just an idea, and there is such a thing as "nothing" or maybe it's "Dark matter"

Since conceptually, and scientifically and even philosophically "Nothing" refers to the absence of "something" and not to something itself. Like.. if someone asks you what you're doing and you say "nothing" you're really doing something. Or if someone asks you what the noise outside was and you say "nothing" it was really something. "nothing" isn't a real, tangible thing. You can't see it, or put it in a box, or touch it. It's not real. It's something we can only imagine in our minds.

So maybe this "empty" space (vacuum) is really filled with something. This "something" has been called "nothing" but someday we'll figure out what it really is.


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