Waste management during space mission / extended stay in space?

Question

during space missions why astronauts have to store their poo and other waste and bring them back to earth for disposal ?

cant NASA design a system to just expel the waste periodically in a degradable protective container , and set it off towards earth ?

while entering earths atmosphere it would burn and turn into dust !! .lol we would see a lot more shooting stars then ;) .....waste disposal would be cheaper too this way .........

Answer 1

Well you cant destroy matter and if the doody as it is scientifically known as ;) will burn up in the atmosphere and create some nasty gasses that can be harmful. You wouldnt want doody rain would you???

Answer 2

S**t from space.  Sounds like a book title.