10-26-2021, 09:21 PM
(10-26-2021, 04:03 PM)Kenzo Wrote:(10-25-2021, 07:46 PM)Ninurta Wrote: Fantastic image! It does an excellent job of showing the stellar density and gaseous nature of the Milky Way disk.
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Why there is gases ? I mean i allways thought space is vacuum and dont have oxygen ,gases much....
So those giant nebulas areas are very different areas ?, not like the space between Earth and Moon ?
Confusing...
Space is a relative vacuum, rather than an absolute vacuum. Gas and dust are present everywhere, but it's a matter of molecules per cubic centimeter - space has a lot less of them. Where you see nebulas, there is a relative concentration of gas and dust, but not nearly enough of it to allow for breathing or to keep a body from exploding due to it's internal pressure.
You only see them because while there are few molecules of gas per cubic centimeter, there are a whole lot of cubic centimeters there to contain gasses, and that concentration, slight though it is, is what shows up as a nebula. It's only a "concentration" of gases relative to surrounding areas with even less gas per cubic centimeter.
It's like being in a smoke filled room - the air is not thicker, heavier, or denser, it's just more visibly smokier.
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Diogenes was eating bread and lentils for supper. He was seen by the philosopher Aristippus, who lived comfortably by flattering the king.
Said Aristippus, ‘If you would learn to be subservient to the king you would not have to live on lentils.’ Said Diogenes, ‘Learn to live on lentils and you will not have to be subservient to the king.’
Said Aristippus, ‘If you would learn to be subservient to the king you would not have to live on lentils.’ Said Diogenes, ‘Learn to live on lentils and you will not have to be subservient to the king.’