Humans have made many trips to the moon and they have left something behind every time. Some of the trash includes 96 bags of poop, pee, and puke. You see, the landing modules had a weight limit to what they could haul, so if they wanted to bring back some moon rocks, they had to leave something behind. It’s not just human waste that was left there, according to, photographs, cameras, and five American flags have been left behind.

You can read more about it here.