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- Xref: sparky sci.astro:12125 sci.space:16022
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- From: mario@cs.man.ac.uk (Mario Wolczko)
- Newsgroups: sci.astro,sci.space
- Subject: Re: Hubble's mirror
- Message-ID: <1992Nov17.121839@cs.man.ac.uk>
- Date: 17 Nov 92 12:18:39 GMT
- References: <1992Nov3.213906.886@mrdog.msl.com> <1992Nov5.145921.1405@tellab5.tellabs.com> <1992Nov9.125222.1@mdcbbs.com> <83625@ut-emx.uucp> <BxqDzI.B1q@zoo.toronto.edu>
- Sender: news@cs.man.ac.uk
- Followup-To: sci.astro
- Organization: Dept Computer Science, University of Manchester, U.K.
- Lines: 9
-
- In article <BxqDzI.B1q@zoo.toronto.edu>, henry@zoo.toronto.edu (Henry Spencer) writes:
- > The *only* test that would have detected the error [an end-to-end test]
- > [would have been difficult due to problems]
- > like gravitational distortion of the primary
- I've seen this mentioned a few times, and it has me confused.
- Any idea why an end-to-end test would have been more susceptible to
- gravitational problems than the null corrector test? Couldn't both be
- performed with the primary flat on its back? And why are there
- more risks of surface contamination?
-