太阳系中所有水的起源都可以追溯到一团巨大的、由尘埃和气体构成的原始星云。正是这团星云在大约45亿年前坍缩,形成了太阳和各个行星。这团星云富含氢和氧——这是构成水的两种元素。当孕育出太阳系的星云坍缩时,自身的角动量让它收缩成了一个旋转的圆盘,原行星盘里较小的物体相互碰撞并粘在一起形成更大的物体,微小的尘埃变成石块,石块变成巨石,巨石再变成直径为千米量级的行星建筑构件——星子。行星形成后剩下了许多星子,它们便 The origin of all water in the solar system can be traced back to a huge, primitive nebula consisting of dust and gas. It is this nebula that collapsed about 4.5 billion years ago, forming the sun and planets. This nebula is rich in hydrogen and oxygen - the two elements that make up water. As the nebula that conceived the solar system collapses, its own angular momentum causes it to contract into a rotating disc, where smaller objects collide and stick together to form larger objects, and tiny dust becomes stone Blocks, stones into boulders, boulders and then into the order of kilometers in diameter planetary building components - stars. After the formation of the planet left many stars, they will