Category Archives: physics

In space, no one can hear you clean.

The first thing you need if you’re building the largest, most powerful telescope in the known universe is a very large, very clean room. In the world’s largest such room, it takes 4,800 HEPA filters running nonstop to achieve “Class 10” clean – … Continue reading

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A Perfect Evening to Celebrate 14 Billion (and Fifty) Years

My son Jake and I hopped a cab from George Washington University to an apartment on the other side of DC whose former occupant, we later learned, was Lena Horne. That set the tone for the evening which started with … Continue reading

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