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deapfreeze
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This poste at Universe Today:<br /><br />If you want clear skies for astronomy, you need to get above the atmosphere. At the top of high mountain is good, space is even better, but that’s expensive. A new NASA infrared observatory is going to be flying as high as possible, to get above most of the atmosphere, at a fraction of the cost of a space mission. It’s called the Stratospheric Observatory for Infrared Astronomy (SOFIA), and the specially modified 747 aircraft made its first checkout flight last week - NASA wanted to see how it handles at low-speed and low-altitude.<br /><br />to view the rest: http://www.universetoday.com/<br /> <div class="Discussion_UserSignature"> <p><font size="2" color="#0000ff"><em>William ( deapfreeze ) Hooper</em></font></p><p><font size="1">http://deapfreeze-amateur-astronomy.tk/</font></p><p> </p> </div>