The Shuttle Test Unit I worked on for Gravity Probe B used ion pumps

Space/Science » in reply to "The best vacuums available on Earth are less than 10 -8 Pa, less than 10e-13 atmospheres!" Not QUITE true...

The Shuttle Test Unit I worked on for Gravity Probe B used ion pumps

Tom Brosz — 7/17/2005 8:59:15 PM (archived)

They never flew it, but it was designed and ready to build for a Shuttle flight on an MPSS. (I think that's the right acronym).

The actual satellite (I think--wasn't my jurisdiction) uses liquid helium temperatures to pull down the vacuum.

The whole thread (116 posts)

NASA will be scraping space science missions... - Chris Vancil - 7/15/2005 7:46:26 PM
- Chris is mostly correct - Gary - 7/16/2005 5:19:51 AM
  - It is not "flags and footprints", it is CAPS - E.P. Grondine - 7/16/2005 4:50:30 PM
    - re: It is not "flags and footprints", it is CAPS - Chris Vancil - 7/17/2005 1:54:45 AM
      - re: It is not "flags and footprints", it is CAPS - E.P. Grondine - 7/17/2005 8:10:04 AM
        
        re: It is not "flags and footprints", it is CAPS - Chris Vancil - 7/17/2005 8:37:14 AM
        
        CAPS - E.P. Grondine - 7/17/2005 4:50:43 PM
        
        re: Craps...snake eyes! - Chris Vancil - 7/17/2005 8:43:48 PM
        
        Well I'd Give It To You But - Mark Eby - 7/18/2005 2:01:36 AM
        
        Arggh! - Mark Eby - 7/18/2005 2:16:15 AM
        
        re: Arggh! - Chris Vancil - 7/18/2005 9:31:53 AM
        
        crapped out - E.P. Grondine - 7/18/2005 1:50:35 AM
        
        re:The Debate Here... - Chris Vancil - 7/18/2005 2:33:22 AM
- Just an idiot Moonbat... - Joe2700 - 7/15/2005 9:11:49 PM
  - re: Just an idiot Moonbat... - Chris Vancil - 7/16/2005 12:14:19 AM
    - I call B*** S***, Chris - E.P. Grondine - 7/16/2005 2:17:33 AM
      - re: I call B*** S***, Chris - Chris Vancil - 7/16/2005 5:33:38 AM
        
        An added gotcha... - Gary - 7/16/2005 5:46:27 AM
        
        Space.com addresses lunar base issues - Daniel - 7/16/2005 6:11:17 AM
        
        re: Space.com addresses lunar base issues - gbaikie - 7/16/2005 8:47:34 AM
        
        So did the House Space Subcommittee: CAPS: 32-0 - E.P. Grondine - 7/16/2005 3:03:40 PM
        
        Hello - Mark Eby - 7/17/2005 3:28:47 AM
        
        and Hi! - E.P. Grondine - 7/17/2005 7:27:22 AM
        
        So You Got Nothing As Usual - Mark Eby - 7/17/2005 2:28:25 PM
        
        And as usual, you're able to see nothing, and understand even less - E.P. Grondine - 7/17/2005 5:01:55 PM
      - ***As moderator, I have to ask you two a question*** - ModBob - 7/16/2005 2:40:24 AM
        
        Mars Cult - Spacegirl2100 - 7/16/2005 6:42:28 PM
        
        re: Idiot Moonbat.... - Joe2700 - 7/17/2005 12:43:31 AM
        
        I'll take Griffin over Zubrin. - Mark Eby - 7/17/2005 3:17:55 AM
        
        re: Cultism Views Warped. - Chris Vancil - 7/16/2005 8:12:01 PM
        
        re: Cultism Views Warped. - Spacegirl2100 - 7/17/2005 1:53:49 AM
        
        re: Cultism Views Warped. - Chris Vancil - 7/17/2005 6:27:25 AM
        
        Appropriate That You Don't Use A Real Name - Mark Eby - 7/16/2005 7:55:55 PM
        
        re: Appropriate That You Don't Use A Real Name - Spacegirl2100 - 7/17/2005 1:51:54 AM
        
        Yeah what's with not using your real name!?!?!?!? - Buck Galaxy - 7/17/2005 8:55:57 PM
        
        Clearly You Are Hand Waving - Mark Eby - 7/18/2005 1:42:06 AM
        
        re: Yeah what's with not using your real name!?!?!?!? - Chris Vancil - 7/17/2005 9:23:47 PM
        
        Oh So You Like - Mark Eby - 7/17/2005 2:59:16 AM
        
        Sexist as well... - Spacegirl2100 - 7/17/2005 5:53:13 AM
        
        No - Mark Eby - 7/17/2005 2:38:30 PM
        
        "Weak-minded women " and you're not? (n/t) - Chris Vancil - 7/17/2005 7:35:23 AM
        
        ***AHEM*** - ModBob - 7/17/2005 7:39:12 AM
        
        for what it's worth - Daniel - 7/17/2005 9:53:44 AM
        
        Thanks for pointing this out.... NOW do they care to explain 'themselves'? (n/t) - ModBob - 7/17/2005 10:19:19 AM
        
        Very Strange - Mark Eby - 7/17/2005 2:55:03 PM
        
        jumpy conclusions - Daniel - 7/17/2005 8:05:30 PM
        
        Merely Idle Speculation Not Conclusions - Mark Eby - 7/18/2005 1:13:46 AM
        
        re: She flung that sword at herself. (n/t) - Chris Vancil - 7/17/2005 7:42:07 AM
        
        ***Just a Warning*** - ModBob - 7/17/2005 7:52:18 AM
        
        re: ***Just a Warning*** - Chris Vancil - 7/17/2005 8:13:24 AM
        
        re: Appropriate That You Don't Use A Real Name - Joe2700 - 7/17/2005 12:52:25 AM
        
        Sure Kid You're A Real Mars Advocate - Mark Eby - 7/17/2005 2:47:38 AM
        
        Sonny, where were you when it started? - Joe2700 - 7/17/2005 2:56:10 AM
        
        re: Sonny, where were you when it started? - Mark Eby - 7/17/2005 3:12:11 AM
        
        re: Sonny, where were you when it started? - Joe2700 - 7/17/2005 6:53:36 AM
        
        Why the heck would you want to dive down a gravity well in the first place? - Tom Brosz - 7/16/2005 5:48:46 PM
        
        Leave it to Tom to be the most reasonable viewpoint here - Buck Galaxy - 7/17/2005 8:41:04 PM
        
        Cool - E.P. Grondine - 7/17/2005 8:17:04 AM
        
        Easy Natural Resources, Safety, & Potential - Mark Eby - 7/16/2005 11:59:46 PM
        
        re: Easy Natural Resources, Safety, & Potential - Tom Brosz - 7/17/2005 8:01:16 AM
        
        Partly Right - Mark Eby - 7/17/2005 3:02:46 PM
        
        re: Why the heck would you want to dive down a gravity well in the first place? - gbaikie - 7/16/2005 10:04:32 PM
        
        re: Why the heck would you want to dive down a gravity well in the first place? - gbaikie - 7/16/2005 10:25:47 PM
        
        re: Why the heck would you want to dive down a gravity well in the first place? - gbaikie - 7/17/2005 1:30:51 AM
        
        Tom is wrong - gbaikie - 7/17/2005 4:25:16 AM
        
        "The best vacuums available on Earth are less than 10 -8 Pa, less than 10e-13 atmospheres!" Not QUITE true... - R.L. - 7/17/2005 8:41:40 AM
        
        The Shuttle Test Unit I worked on for Gravity Probe B used ion pumps - Tom Brosz - 7/17/2005 8:59:15 PM
        
        re: "The best vacuums available on Earth are less than 10 -8 Pa, less than 10e-13 atmospheres!" Not QUITE true... - gbaikie - 7/17/2005 10:33:25 AM
        
        re: Lunar Sourcebook data - ken murphy - 7/17/2005 4:54:46 AM
        
        So Why Not Provide The Link? - Mark Eby - 7/17/2005 3:37:28 PM
        
        re: So Why Not Provide The Link? - ken murphy - 7/17/2005 4:07:17 PM
        
        Sorry Thought Your Were Referring To A PDF or Word File (n/t) - Mark Eby - 7/17/2005 4:13:42 PM
        
        re: Why the heck would you want to dive down a gravity well in the first place? - ken murphy - 7/16/2005 6:20:46 PM
        
        I might be wrong about the vacuum level. - Tom Brosz - 7/17/2005 7:56:27 AM
        
        re: Why the heck would you want to dive down a gravity well in the first place? - Mark Eby - 7/17/2005 3:23:27 AM
        
        I designed and built an experimental vacuum chamber... - R.L. - 7/17/2005 8:21:58 AM
        
        re: I designed and built an experimental vacuum chamber... - Mark Eby - 7/17/2005 2:53:31 PM
        
        re: ***As moderator, I have to ask you two a question*** - Mark Eby - 7/16/2005 3:01:35 PM
        
        Forgot Another Key Issue - Mark Eby - 7/16/2005 4:18:59 PM
        
        Compare & Contrast Question - ken murphy - 7/16/2005 5:39:37 PM
        
        re: Compare & Contrast Question - Chris Vancil - 7/17/2005 7:34:01 AM
        
        Uh The Moon Does Have A Far Better Vacuum Than Mars - Mark Eby - 7/17/2005 3:05:39 PM
        
        re: I'm not say it doesn't. I question his Nanotech need for "perfect" lunar vacuum. All his points are flawed. (n/t) - Chris Vancil - 7/17/2005 8:51:56 PM
        
        re: Compare & Contrast Question - Chris Vancil - 7/17/2005 6:42:10 AM
        
        re: Compare & Contrast Question - Mark Eby - 7/17/2005 4:30:43 AM
        
        You're right! I'm sold! - ken murphy - 7/17/2005 5:20:46 AM
        
        Boy Did You Miss The Point - Mark Eby - 7/17/2005 3:17:17 PM
        
        Hey Thanks For Giving Me More Ammo - Mark Eby - 7/16/2005 6:21:14 PM
        
        re: Hey Thanks For Giving Me More Ammo - ken murphy - 7/16/2005 7:37:53 PM
        
        re: Hey Thanks For Giving Me More Ammo - Mark Eby - 7/17/2005 3:43:53 AM
        
        Still Waiting... - ken murphy - 7/17/2005 4:34:10 AM
        
        And On The Data Provided - Mark Eby - 7/17/2005 4:41:58 AM
        
        re: And On The Data Provided - ken murphy - 7/17/2005 5:32:42 AM
        
        You're Economics Are A Joke - Mark Eby - 7/17/2005 3:25:35 PM
        
        re: You're [sic] Economics Are A Joke - ken murphy - 7/17/2005 4:47:26 PM
        
        Great - Mark Eby - 7/17/2005 5:21:59 PM
        
        re: Great - Chris Vancil - 7/17/2005 9:05:03 PM
        
        re: And On The Data Provided - Joe2700 - 7/17/2005 6:49:44 AM
        
        re: How to Make Friends & Influence People - ken murphy - 7/17/2005 5:30:24 PM
        
        Let's See - Mark Eby - 7/18/2005 1:37:07 AM
        
        Uh 9:30 PM to 9:34 PM (n/t) - Mark Eby - 7/17/2005 4:37:36 AM
        
        re: Hey Thanks For Giving Me More Ammo - Spacegirl2100 - 7/16/2005 7:08:50 PM
        
        Hello - Mark Eby - 7/17/2005 3:45:24 AM
        
        I agree with you entirely here: there is no economic justification for manned Mars missions - E.P. Grondine - 7/16/2005 4:33:37 PM
        
        re: I agree with you entirely here: there is no economic justification for manned Mars missions - Joe2700 - 7/17/2005 12:55:18 AM
        
        There is no economic justification for manned Mars missions - E.P. Grondine - 7/17/2005 5:27:36 PM
        
        re: There is no economic justification for manned Mars missions (that Ed knows) - Chris Vancil - 7/18/2005 2:49:40 AM
        
        re: ***As moderator, I have to ask you two a question*** - E.P. Grondine - 7/16/2005 4:06:24 PM
        
        Is There Any Point Reading Past The First Paragraph? - Mark Eby - 7/16/2005 4:31:37 PM
        
        Hell, Mark, you haven't even made it past the first paragraph? - E.P. Grondine - 7/16/2005 4:44:07 PM
        
        re: Are you off meds? - Chris Vancil - 7/17/2005 7:13:09 AM
        
        As usual: Mark is both perceptive and correct - Gary - 7/16/2005 3:47:35 PM
        
        Amazing: Mark and Gary agree - E.P. Grondine - 7/16/2005 4:27:01 PM
        
        Holy F**K! Mark, Gary and EP agree! - Adam - 7/18/2005 5:53:02 AM
  - Or What A Dingbat Thinks (n/t) - Mark Eby - 7/15/2005 10:44:43 PM
    - re: Or What A Dingbat Thinks - Joe2700 - 7/17/2005 12:48:11 AM

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