Re: Windshield damage

Jim Varney (jvarney@mail2.quiknet.com)
Mon, 07 Oct 1996 13:20:54 -0700

>>Date: Sat, 05 Oct 1996 08:43:04 -0700
>>From: Jim Varney <jvarney@mail2.quiknet.com>
>>To: seesat-l
>>Subject: Columbia Delayed: Debris Damage
>>
>>Press release from NASA. Though they don't say directly, the
>>windshield damage is due to orbital debris.
>

To which Bruno Tilgner replied:

>Not necessarily. Micrometeorites are an even more probable cause. Several of
>Mir's windows had to be replaced more than once because of gradual abrasion.

Not according to the Meteoroid and Orbital Debris Working Group at NASA:

"The average impact speed of debris on a spacecraft is 10 km/s, only half 
that of meteoroids, but the population of debris in the typical earth 
orbits is much higher than that of meteoroids, making debris the greater 
hazard for most spacecraft."

see http://elses1.msfc.nasa.gov/see/mod/mod.html

 -- Jim

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Jim Varney       | 121^ 23' 54" W,  38^ 27' 28" N   |           Sacramento, CA
Member, SeeSat-L |           Elev. 31 ft.           |                         
Member, Sacramento Valley Astronomical Society      |jvarney@mail2.quiknet.com
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