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Captured cosmic dust may have interstellar origins

机译:捕获的宇宙尘埃可能起源于星际

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En route to a 2004 rendezvous with the comet Wild 2, NASA's Stardust probe spent 195 days with its cosmic dust collector, a large tray tiled with silica aerogel, facing the interstellar wind. The hope was that it would snag a few motes of extrasolar dust. Such particles are rare inside the solar system: Intense magnetic fields at the edge of the heliosphere effectively shield us from the smallest grains, but the occasional larger ones-those weighing more than a few femtograms-can barrel through that barrier. During its time spent just outside the Martian orbit, Stardust was bound to encounter some of those particles.
机译:在前往2004年与野生2号彗星会合的途中,美国宇航局(NASA)的星尘探测器(Stardust)用其宇宙集尘器(用硅石气凝胶铺满瓷砖的大托盘)花了195天,面对星际风。希望是它会吸附一些太阳系外尘。这样的粒子在太阳系内是罕见的:在日光层边缘的强磁场有效地将我们与最小的谷物隔离开来,但是偶尔的较大的粒子(重于几飞克的粒子)可以穿过该屏障。在火星轨道外度过的这段时间内,星尘一定会遇到其中一些粒子。

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