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June 25, 2004

Clouds On The Edge Of Space

What Causes Noctilucent Clouds?

Northern summer has arrived, and that means it's time to watch out for noctilucent clouds (NLCs). On some summer nights, just after sunset, NLCs snake across the sky glowing electric blue-white.

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Boeing Delta II Keeps GPS Constellation Healthy

Satellite Safely In Orbit

A Boeing Delta II rocket successfully deployed to space a replacement satellite for the US Air Force’s Global Positioning System (GPS) Wednesday.

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