Hawking's main concern was that a fleet of alien spacecraft could turn up wanting to strip mine the Earth for its bountiful resources.

霍金的主要忧虑是一队外星人飞船舰队可能会突然出现，想要将地球上储量丰富的矿藏洗劫一空。

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The airmen tramped through Rendlesham Forest in search of the source of mysterious night - time lights that looked like an alien spacecraft.

一位飞行员正穿梭于蓝道申森林寻找着一束神秘的夜光源，像是由外星飞船发出的一样。

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When comet Hale-Bopp appeared in 1997, rumors surfaced that an alien spacecraft was following the comet - covered up, of course, by NASA and the astronomical community.

1997年，海尔—波普彗星出现的时候，有一种传言说有一艘外星人的飞船躲在该彗星的后面，当然了，这种谣言是从美国宇航局和天文学界传出来的。

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Exhausted after cycling 1, 259 miles in 83 hours as part of an endurance challenge called the Race Across America, he becomes convinced that the motorhome carrying his support team is actually an alien spacecraft, and that his team's pleas for him to come inside and get some rest are merely a cunning pretext to get him to co-operate with a spot of alien probing.

ECONOMIST: A medley of aliens and conspiracy theories

The memo is part of a cache of hundreds of pages of accounts under the heading "Unexplained Phenomenon, " describing claims of UFO sightings, spacecraft debris and alien landings.

CNN: FBI's 'flying saucers' online memo intrigues public