How much time does the planetary core spend inside the embryonic cloud? The lifetime of the protosolar nebula is pretty short -- only a million years or so. I

How much time does the planetary core spend inside the embryonic cloud? The lifetime of the protosolar nebula is pretty short -- only a million years or so. It seems like if it spent much time there, it should shows signs of the crushing gravitational pull required for it to maintain a large gaseous atmosphere during birth. I'm not sure what you mean here.