Stars are made of 75%=helium, 25%=hydrogen
The Cosmic Microwave Background=CMB is everywhere
light is red shifted meaning it is moving away
CMB is the microwaves left over
Super novas create hevy metals
a sun will fuse atoms together making larger ones
The largest suns can make iorn and even denser meatals
it is closer
shorter distance it has to take around its sun
closer to the sun the smaller the planet so the faster it is pulled