So a vacuum is devoid of matter & heat except when it ain't ...................Sounds logical to me
Horizon: How Big Is the Universe? (T) Mon 21:00
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Scientists say matter is made up of protons, neutrons and electrons. They seem to always neglect to mention the vastly more prolific morons.
Even with our limited veiw of the stars, I don't believe it is accurate enough. The temp is taken to be just under 3 kelvin and lone Hydrogen atoms permeate space everywhere.
Add to that 75% of the mass of the universe is still missing (dark matter), 'none' just may be a very long way off.
So a vacuum is devoid of matter & heat except when it ain't ...................Sounds logical to me
LOL. Think of it as analogous to the glass with only a bit of water in the bottom. The water represents the matter and energy. It's there, but only in a small bit of space at the bottom of the glass; the rest of the glass is empty. Likewise matter and energy only occupy a small part of space (held in close proximatey to other matter by gravity) while the rest of space (the very vast proportion of space) is empty (and a vacuum)
Even with our limited veiw of the stars, I don't believe it is accurate enough. The temp is taken to be just under 3 kelvin and lone Hydrogen atoms permeate space everywhere.
Add to that 75% of the mass of the universe is still missing (dark matter), 'none' just may be a very long way off.
Perhaps. But that's not quite the way I was taught it. I say not quite because my professors would not have used the word "permeates." A presence, yes. Permeates, no. For practical discussion, a vacuum devoid of heat or other energy.
Photons exist in (ie. pass through) a vacuum, as do other wavelengths of energy (infra red, radio, microwave) etc. A vacuum certainly isn't devoid of everything.
Nothing surreal about that. There are several blue oranges in the fruit bowl in my kitchen.
I really must throw them out.
No. It isn't. But they dissapate as they do and the amount becomes miniscule once they travel light years away from the source. And as the whole of space (extremely vast) compared to that space occupied by matter and energy in the form of galaxies and solar sytems within those galaxies (extremly miniscule by comparison), for practical discussion, the comparison stands.
Jokes aside, there are red oranges, called "blood oranges" grown and sold here.
It isn't empty though - it has dimensions, time, it can be defined, measured. We know it is there - this vacuum. It is detectable.
The spacial vacuum beyond the Earth's atmosphere certainly isn't void of matter, It's full of freakin' satellites & other bits of orbiting junk.....................aliens shouldn't have any trouble finding us......turn left at Mars & follow the garbage trail
