The Mars Exploration Rover, Spirit, is shown in this undated artist's drawing released by NASA. The rock-inspecting rover hurtled toward Mars for a perilous landing on January 3, 2004 on what NASA hopes will become a historic mission to answer the age-old question of whether life existed on the red planet. The robotic explorer's arrival on Mars would be the climax of a weekend of interplanetary discovery after a U.S. spacecraft on January 2, 2004 gathered particles from a comet in a first that could give scientists clues about how Earth began. Photo by Reuters (Handout)
词汇：
rover n.流浪者，漫游者
hurtle v.急飞
perilous adj.危险的
climax n.高潮，顶点
interplanetary adj.行星间的，太阳系内的
particle n.粒子，微粒
comet n.彗星 |
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