Our little neighbor has a lot of earth stuff on it. It turns out we couldn't help but leave a little trash and souvenirs behind on our excursions. It is not fun or in this case practical to have to clean up after ourselves. Some of the stuff we left has some practical use and some was just for fun. Science was always involved in anything left up there.

We trashed the place up.

There is approximately 400,000 lbs of trash, debris and equipment left from our moon adventures. We even left some feces up there. Most of the junk up there is from equipment used for experiments, space probes and lunar rovers. Getting these items to the moon is one thing getting them back is another. It was safer and more efficient to just leave it there and get our astronauts home. One thing we left up there to shoot lasers at from earth.

There is a reflector on the surface.

Apollo 11, 14 and 15 all left laser light reflectors behind on the moon. Our astronauts placed and aligned them up with the earth. These lasers are used to collect data from the moon; more precisely the distance of the moon from the earth. You won't be able to use a laser pointer on the moon. They are not powerful enough. You need a massive laser.

There are golf balls on the moon.

Alan Shepard smuggled up a golf club head and golf balls during the Apollo 14 mission. Once on the moon he attached the head to the shaft of a piece of equipment. He became the first person to play gold somewhere other than earth. Alan shanked the first ball but was able to hit the second ball over 200 yards.

Footprints forever.

One of the other things that we left was our footprints. With no wind or water on the surface of the moon they will probably last forever. Any movements that made tracks there back in the 60s and 70s are still there today.

Sources for Photos and Content:
http://www.nasa.gov/audience/forstudents/k-4/home/F_Apollo_11.html
http://www.spiegel.de/international/zeitgeist/saving-moon-trash-urine-containers-space-boots-and-artifacts-aren-t-just-junk-argue-archaeologists-a-684221.html
http://listverse.com/2013/12/04/10-strange-secrets-of-the-moon/
http://www.moonlandinghoax.org/8.html
http://www.pga.com/news/golf-buzz/feb-6-1971-alan-shepard-plays-golf-moon