Shows that all objects fall at the same rate regardless of mass, added by the fact that the moon has no air to cause resistance with the feather. Also, note that they both fall slower than on Earth due to 1/6 gravity.
In web browser, go to the following web page → http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html
Titile of the web page: The Apollo 15 Hammer-Feather Drop
Click on: 8.3 Mb Quicktime movine of the demonstration - approximately 20 seconds.