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Orion constellation is the most bright one in Winter sky. Inside it there a lot of hydrogen emission nebula, like M42 or Horsehead Nebula or even the Barnard's Loop.
by Anonymous on 2009-05-11
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2015-10-18 16:33:07       
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2012-10-07 20:35:09       
What you're describing is a diusffion pump, which is a type of vacuum pump. The oil is not sprayed directly into the chamber, but inside the pump body. In fact when diusffion pumps fail they can spray oil into the chamber and this makes a huge mess. They are used to get a higher quality vacuum than what is possible with a mechanical pump. A mechanical pump can get a chamber down to pressures of about a millitorr (10^-6 atm), but diusffion pumps can get down to high vacuum pressures of 10^-8 torr (10^-11 atm). Turbopumps and cryopumps can also get down to these pressures and lower, but operate via different principles.I was wondering myself what NASA uses to pump out this chamber. My guess is that they're only interested in the mechanical stresses on the spacecraft, so high vacuum is unnecessary. They probably have an array of Really Big mechanical pumps to get a rough vacuum.
2011-04-12 02:21:48       
Touchdown! That's a really cool way of puittgn it!
2009-05-11 17:27:39       
At right side there is a cross from a landscape, but it is nearly invisible.
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