high altitude test

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Starfish Prime was a high-altitude nuclear test conducted by the United States on 9 July 1962 as part of Operation Fishbowl over Johnston Atoll. It was successfully detonated at an altitude of 400 km (250 mi) at 09:00:09 Honolulu time.

Starfish Prime’s electromagnetic pulse was much larger than originally expected and drove much of the instrumentation off scale, as well as causing electrical damage in Hawaii, which was about 1,445 km (898 mi) away from the detonation point. It knocked out about 300 streetlights, set off numerous burglar alarms and damaged a telephone company microwave link. 

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Video: NASA’s ‘flying saucer’ tested in the upper atmosphere.

NASA is testing a “flying saucer” designed to land on Mars and deliver large payloads to the Red Planet, and the agency has released a spectacular video of a high-altitude test conducted over Hawaii this past June. In it, the Low Density Supersonic Decelerator (LDSD) is brought up 180,000 feet high into earth’s atmosphere, a place where conditions are similar to those on Mars. After confirming that the vehicle could fly in these conditions, NASA then tried to slow the craft down with two new technologies — a funky, donut-shaped “Supersonic Inflatable Aerodynamic Decelerator” and a massive supersonic parachute.