The sperm holds Y and X chromosomes while the egg has two X's instead.
spermatogenesis
Planets are pieces of material that orbit a star such as the earth orbits the sun. Stars are 'suns' and are distributed throughout the universe. Stars are much larger than planets hence the reason...
Female gametes form to the right of the wall of chromosomes, where as the gametes in males form to the left and in the middle of the wall.