What happens at the end of Mario galaxy

at the end of Mario galaxy bowsers galaxy reactor get destroyed (with him in it) and then Mario gets a grand star and goes off with princess peach. but then the reactor turns into a black hole and sucks Mario and peach in it. but suddenly a white luma sends all the lumas down to the black hole (the lumas get killed),then the black hole explodes... after that Mario ends up back in the mushroom kingdom with all the enemies for a galaxy party (i think the enemies turn good,including bowser and bowser jr) and then Mario says "welcome,welcome all new galaxy!".... and then if you get all 120 stars thers a super secret ending where you see the white luma still alive......