LEGO SYSTEM Space : 9771


Space / 9771	9770 \| 9772

Subject:	Re: Evolution of Earth and moon (was: Couldn't resist)
Newsgroups:	lugnet.space, lugnet.off-topic.geek
Date:	Wed, 11 Jul 2001 00:12:11 GMT
Viewed:	9048 times

In lugnet.space, Lindsay Frederick Braun writes: > Weren't there other methods used recently as well? I'm not > sure that any would be as accurate as a laser, given that > the international meter standard is based on the speed of > light (as of the 1980s, I think). Somehow using radar sticks > in my mind, but that might just be a holdover from earlier > measurement in the 1940s and 1950s. Would there be any difference in the accuracy of laser vs. radar? I'm not enough of an EE geek to know, but thought "no" because they're just different wavelengths of the same thing, right? Or does the wavelength difference (it IS many orders of magnitude in difference) matter? ++Lar

Message has 2 Replies:

		Re: Evolution of Earth and moon (was: Couldn't resist)
(...) Not quite. There's a good comparison here (URL) talking about speed radar versus laser. Basically the laser is more accurate, but requires more accurate aiming by the operator. ROSCO (23 years ago, 11-Jul-01, to lugnet.space, lugnet.off-topic.geek)

		Re: Evolution of Earth and moon (was: Couldn't resist)
(...) Isn't the theory behind rainbows (or light spectrums in general) that the different wavelengths refact by differing amounts, and so white light is "spread" into a spectrum of colours? If that's the case then radar and laser energy would (...) (23 years ago, 12-Jul-01, to lugnet.space, lugnet.off-topic.geek)

Message is in Reply To:

		Re: Evolution of Earth and moon (was: Couldn't resist)
Hi, Long time no see, John! Have you just been lurking about? (I'm finally back from Europe myself.) Coming to Brickfest? How's JHU? (...) Weren't there other methods used recently as well? I'm not sure that any would be as accurate as a laser, (...) (23 years ago, 8-Jul-01, to lugnet.space, lugnet.off-topic.geek)

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