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Pioneer 10 Crosses the Asteroid Belt (Illustration)

If spacecraft are to visit the outer solar system, they must cross the asteroid belt between Mars and Jupiter. The Pioneer mission was faced with the question of just how dangerous this asteroid belt would be to a spacecraft passing through it.

nasa.gov/image-detail/arc-1974

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小森林

每个人都有属于自己的一片森林,也许我们从来不曾走过,但它一直在那里,总会在那里。迷失的人迷失了,相逢的人会再相逢。愿这里,成为属于你的小森林。