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Article #367Re: Apollo-11 lunar experiment still useful after 20 years (Forwarded)
From: Wayne Hayes
Date: Wed, 19 Jul 1989 21:36
Date: Wed, 19 Jul 1989 21:36
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In article <28736@ames.arc.nasa.gov> yee@trident.arc.nasa.gov (Peter E. Yee) writes: > Once the laser beam hits a reflector, scientists at the >observatories use sensitive filtering and amplification equipment >to detect the return signal. The reflected light is too weak to >be seen with the human eye, but under good conditions, one photon >-- the fundamental particle of light -- will be received every >few seconds. Is this right? I would think that many more than that would get back. Besides, if you only got one back every few seconds, it would be useless for the accuracy of timing needed to calculate the moons distance with "unprecedented accuracy". -- ------------------------------------------------------------------------------ "Open the pod bay doors, HAL." "I'm sorry Dave, I'm afraid I can't do that." Wayne Hayes INTERNET: wayne@csri.toronto.edu CompuServe: 72401,3525
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!csri.toronto.edu!wayne From: wayne@csri.toronto.edu (Wayne Hayes) Newsgroups: sci.space Subject: Re: Apollo-11 lunar experiment still useful after 20 years (Forwarded) Message-ID: <1989Jul19.173616.8795@jarvis.csri.toronto.edu> Organization: University of Toronto, CSRI References: <28736@ames.arc.nasa.gov> Date: 19 Jul 89 21:36:15 GMT