You want to know something funny? We don't actually know how our planet formed. We have a broad general idea, but the finer details are a lot trickier to unravel.
We do have a model that is currently accepted as the most likely explanation so far: that Earth formed from the gradual accretion of asteroids. However, even here, there are some facts about the formation of our planet that are challenging to explain.A new paper, combining experimentation with modeling, has revealed a new formation pathway that much more neatly fits the characteristics of Earth.
There's a whole bunch of question marks over the planet formation process, but scientists have been able to piece together a general picture. When a star forms from a dense clump of matter in a molecular cloud of dust and gas in space, the material around it arranges into a disk that orbits and spools into the growing star.
Scientists have posed various explanations, including heat generated during the collisions that could have vaporized some of the lighter elements. So Sossi and his colleagues set out to investigate another possibility: that the rocks that combined to make Earth were not chondritic asteroids from Earth's general orbital neighborhood, but planetesimals. These are larger bodies, the"seeds" of planets that have grown to a size large enough to have a differentiated core.
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