Louis Friedman, executive director of the Planetary Society, says that the sails must be launched to test them, because there is no solar wind in Earth's atmosphere.

行星社执行官Louis Fried man告诫道，太阳帆必须发射升空才能进行实验，因为在地球大气中不存在太阳风。

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Friedman said one review his office conducted last year turned up backlogs in flight and laboratory test schedules for five of nine nuclear missile warheads and bombs in the operational stockpile.

CENTERFORSECURITYPOLICY: Center For Security Policy