行星的构成要素出现得惊人地早

最新研究表明，行星形成的原材料可能在宇宙大爆炸后不久便已具备。这比此前认为的行星形成时间要早得多，甚至早于第一代星系的形成。

Planet building was supposed to be one of the universe's slow projects, something that only got going billions of years after the Big Bang. New research suggests otherwise. The raw materials for rocky worlds, and perhaps even the water needed for life, may have been ready to go just 100 million years after the Big Bang, long before the first galaxies had even taken shape.