Seven Wonders of Age of Steam: We selected seven wonders from the 19th century that represent the most amazing achievements of the age of steam > Full Story

VASIMR Engine - I was reading about the VASIMR engine that Franklin Chang Diaz is building and I read it has an ISP of 4000-5000 while a falcon 9 rocket built by SpaceX has an ISP of only 300 and some. My question is what ISP would a plasma ion engine need to lift off from the surface of earth and make it to space. >Full Story - Have a question? Click here to send it to us.

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