Horizon: How Big Is the Universe? (T) Mon 21:00

  • Come along to the amazing Summer Moot (21st July - 2nd August), a festival of bushcrafting and camping in a beautiful woodland PLEASE CLICK HERE for more information.
Scientists say matter is made up of protons, neutrons and electrons. They seem to always neglect to mention the vastly more prolific morons.
 
True enough. But not neccessarily a measureable amount and for the context of my post "none" is accurate enough.

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:D

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.
 
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)

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.
 
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.

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.
 
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.

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 :D
 

BCUK Shop

We have a a number of knives, T-Shirts and other items for sale.

SHOP HERE