Std: planets condensed from the same dusty plasma as the star(s) they orbit. JJW: planets are retired stars, which simply burned out sooner than larger aggregates in the system. CLC: planets are retired stars, but they don't form by magnetic pinches. CRD: Growing Earth Hypothesis: planets grow into stars by the same unknown mechanism by which they grow from moons into planets.
Hypotheses
Hypotheses
