Which element is six times stiffer than steel yet lighter than aluminum? 
It’s beryllium! And here’s why we’re using it for the James Webb Space Telescope's mirrors 
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Elements of Webb: Beryllium Part 1, Ep03
Beryllium is a rare lightweight metal. This episode explores the reason why it's a perfect material for the Webb telescope's mirrors. Credit: NASA's Goddard Space Flight Center
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Would this be a better material to make airframes for stronger lighter aircraft??
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No. It's too brittle. It will crack way more easily than titanium, aluminum, or composites.
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Learned something new . Thanks
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And you know, how important beryllium is.. Especially beryllium 8 in our sun's fusion process.. The most underrated and possible most important element...
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If it's heavy, the rocket will have to burn more fuel to attain the escape velocity.
End of conversation
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Nice, super excited for its launch! (Hoping that it doesn't get delayed any further
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Beryllium can also be used for airplanes and bullet trains
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