Re: NASA article on history of solar sails

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Mon Aug 18 2008 - 22:03:06 UTC

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Why? A bright Iridium flare is >8km from roughly 1m reflector
20*20 larger mirror onto 1.6*1.6 smaller circle becomes
2.8+2.8                           +0.5+05 = 6.6 magnitudes brighter,
or around -14 , brighter than the full Moon?


----- Original Message ----- 
>>http://science.nasa.gov/headlines/y2008/31jul_solarsails.htm?list1099069
> 
> And did anyone else scratch their heads over "..a 20-meter diameter 
> spinning mirror ... produced a 5 km wide bright spot..."
> The word "bright" must be a relative term unless conservation of 
> energy is suspended.


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