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" ... An illustration of a protoplanetary disk, where planets and planetesimals form first, creating... [+] 'gaps' in the disk when they do. As soon as the central proto-star gets hot enough, it begins blowing off the lightest elements from the surrounding protoplantary systems. A planet like Jupiter or Saturn has enough gravity to hold onto the lightest elements like hydrogen and helium, but a lower-mass world like Earth does not. ... "
" ... An illustration of a protoplanetary disk, where planets and planetesimals form first, creating... [+] 'gaps' in the disk when they do. As soon as the central proto-star gets hot enough, it begins blowing off the lightest elements from the surrounding protoplantary systems. The pre-solar nebula likely consisted of all sorts of radioactive isotopes, but ones with short half-lives, like carbon-14, are all gone by the present day. ... "