1999年到2002年，他担任美国国家航空和航天局太空生物学研究所的管理者。
From 1999-2002 he was Director of the National Aeronautics and Space Administration (NASA) Astrobiology Institute.
美国国家航空和航天局宣布，这次飞行任务长达九天，其明确目的之一将是研究太空飞行对衰老过程的影响。
NASA announced that one of the tangible objectives of this nine-day mission was to don research into the effects of space flight on the aging process.
美国国家航空和航天局称，一场强烈的太阳活动已干扰无线电通信，可能在接下来的几天里中断电网、无线及卫星通讯。
A powerful solar eruption has disturbed radio communications and could disrupt electrical power grids, radio and satellite communication in the next days, NASA said.
应用推荐