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As the planets in our solarsystem cooled and solidified the solar winds from the sun which had drawn the gases to orbit in the first place had blown the atmospheres off the nearest planets and this is why the farther you get from the sun the thicker the atmospheres the planets have
Lots of assumptions to make up a final assumption. And all assumptions rely on there being no unknown factors involved in billions of years.. And to remind you we have been relative intelligent for hundreds of years and been able to observe space at the same time table.