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Space Forum / Amateur Astronomy / July 2006Is space a total Vacuum?
Additionally, is space a total vacuum? What about dark energy and dark matter that occupy more than 96% of the universe? > Additionally, is space a total vacuum? What about dark energy and dark > matter that occupy more than 96% of the universe? No .. but don't try breathing out there :) >Additionally, is space a total vacuum? What about dark energy and dark >matter that occupy more than 96% of the universe? Nothing is a total anything. Space is, in general a very good vacuum but not perfect. From Wikipedia http://en.wikipedia.org/wiki/Orders_of_magnitude_(density) 1.48 kg/m3 Earth atmosphere at sea level 1.34 × 10-5 kg/m3 Earth atmosphere at 82 kilometer altitude 1.00 × 10-18 kg/m3 Observed density of space in core of galaxy > Additionally, is space a total vacuum? What about dark energy and dark > matter that occupy more than 96% of the universe? The WMAP data give the most precise values for the density of ordinary [baryonic] matter made of protons and neutrons: 0.4 yoctograms per cubic meter, and for the total of dark and baryonic matter: 2.5 yoctograms per cubic meter. See: http://edu-observatory.org/eo/cosmology.html Srinidhi asked: > > Additionally, is space a total vacuum? What about dark energy and dark > > matter that occupy more than 96% of the universe? Sam Wormley replied: > The WMAP data give the most precise values for the density of ordinary > [baryonic] matter made of protons and neutrons: 0.4 yoctograms per cubic > meter, and for the total of dark and baryonic matter: 2.5 yoctograms per > cubic meter. Now there's a helpful reply for a neophyte! Davoud  Signatureusenet *at* davidillig dawt com <<Sam Wormley replied: > The WMAP data give the most precise values for the density of ordinary > [baryonic] matter made of protons and neutrons: 0.4 yoctograms per cubic > meter, and for the total of dark and baryonic matter: 2.5 yoctograms per > cubic meter. Now there's a helpful reply for a neophyte! Davoud >> And I get crap for criticizing newbies with very poor spelling for complaining about having to tilt and swivel their telescopes to point them... rat ~( );> >And I get crap for criticizing newbies with very poor spelling for >complaining about having to tilt and swivel their telescopes to point >them... >rat 12 hours ago, you said the guy was a troll. Which is he; a troll or newbie? Errol >And I get crap for criticizing newbies with very poor spelling for >complaining about having to tilt and swivel their telescopes to point >them... >rat To add a little humor to this, here's an excerpt from Wikipedia, the free encyclopedia: In Internet terminology, a troll is a person who posts rude or offensive messages on the Internet, such as in online discussion forums..... BoycottAl was trying to understand why what he saw in his scope didn't match what was shown in his manual. Which by the way, if I'm correct, means he was doing exactly what you accused him of not doing - reading. In fact, he discovered a disparity between the manual and his real life observation; perhaps lending to wondering if there was an alignment fault with his scope. And so he asked a question. And basically, you insulted him. So, judging from the above definition; who's the troll? Errol Ah yes... it's comfortable in a perverted sort of way to return to this group after a long hiatus and see that some things never change. > >And I get crap for criticizing newbies with very poor spelling for > >complaining about having to tilt and swivel their telescopes to point [quoted text clipped - 20 lines] > > Errol How exactly do they go from a refined grid of temperature measurements to knowing precisely the average composition of all things? |
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