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当你知道那些庞大的银河系、河外星系的时候,就会以为太阳系小得微不足道。事实上,太阳系的疆域至今还是个谜,远比你我想象的要大……
When you know those huge galaxies, extragalactic galaxies, you will think that the solar system is insignificantly small. In fact, the terrain of the solar system is still a mystery far, far bigger than you and I can imagine ...