When Charles Duke went to explore the moon’s Descartes Highlands as part of Apollo 16 mission, he left his family photograph on the moon's surface, which remains there even today.
Family photo
Prior to humans, it was a normal practice to send animals into space to determine whether it was safe for living beings to survive there. Those who were unable to return remain.
Dead Animals
Most of the pee produced by astronauts has simply been discarded overboard over the years. When pee is exposed to the frigid vacuum of space, it swiftly freezes into small crystals that float around as debris.
Pee
In 1997, the ashes of the Star Trek creator were sent to space, reflecting his passion for the cosmos.
Gene Roddenberry’s ashes
In 2001, Pizza Hut delivered the first pizza in space to Russian cosmonaut Yuri Usachov. The restaurant paid around £750,000 to do so.
Pizza
In November 2008, astronaut Heide Stefanyshyn-Piper lost her grip on her tool bag, and it floated away into space. The bag contained tools worth £650,000.
Tool Bag
It is not the one you are thinking. In 2012, a NASA spacecraft clicked a photo of a Mickey Mouse shaped crater on Mercury.
Mickey Mouse
In 2007, an astronaut threw an unnecessary tank of ammonia in space in order to create space. It, however, burnt up in the Earth’s atmosphere.
Tank of Ammonia
In 2015, astronauts grew their vegetables for the first time in space aboard the International Space Station in an open-air vegetable garden.
Vegetables
Piers Sellers, a spacewalking astronaut, lost a spatula while spreading some goo as a test of heat-shield repair materials.