Re: [ATM] Big honeycombed Zerodur mirror

[hermit <hermit@outofoptions.com>]

Thanks.  I'll look into this, but, if Apache were down, the web page 
wouldn't be up.  Mailman and Qmail are the things reposnible for mail 
transport.  I have an email from the list time stamped two hours after 
this message.  Just got one more after I sent a test.  Maybe a slow day? 
Happens.  Did you send any mails that didn't get posted?

Ken

mlbrown@everstrive.com wrote:

>Sofia's 2.7m honeycombed Zerodur mirror.
>
>http://antwrp.gsfc.nasa.gov/apod/ap041022.html
>
>The candy-dish appearance of this high-tech astronomical mirror is
>striking. Made of a special glass ceramic material called Zerodur, it
>actually measures 2.7 meters across. The transparent surface has not yet
>received a reflective coating, so the weight-reducing internal honeycomb
>structure is visible with attractive blue and yellow tints provided by a
>protective tarp and background lighting. Recently unveiled, the telescope
>mirror is destined to fly on the Stratospheric Observatory For Infrared
>Astronomy (SOFIA). Since water vapor in Earth's troposphere tends to block
>infrared light, SOFIA will operate from a modified Boeing 747 jetliner at
>altitudes above 40,000 feet. As the largest airborne observatory in the
>world, SOFIA will explore a host of cosmic environments including sites of
>star birth and death, the formation of distant solar systems, and black
>holes in active galaxies. 
>
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