Sorry Pluto
In: Physics
Basically it was a combination of two things.
In the early years of our solar system you could think of it as a giant cloud of hot dust and gas spinning very fast.
As the solar system spun, lighter elements such as the gasses were pushed outwards to the edge of the solar system and heavier elements like metals were not pushed as far. Think of how when you spin a ball on a string and if you let go it will fly away. Same concept.
In addition to this the sun helped push these elements as well throguh what’s called solar wind. This is basically the light from the sun impacting the elements and pushing them. This act the same way, pushing lighter elements more than heavier elements.
After the universe was separated like this, dust and gas started to coalesce into larger and larger bodies until we got the planet we know today with mostly gas in the outer region and mostly rocks in the inner region.
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