[color=#0000ff][i][color=#0000ff][i][color=#999999]This activity belongs to the GeoGebra book [url=https://www.geogebra.org/m/mes4bgft]The Domain of the Time[/url].[/color][/i][/color][/i][/color][br][br]In this video, we see Commander David Scott during the Apollo 15 mission (1971) conducting an experiment broadcasted to Earth during the final minutes of the third and last extravehicular activity on the Moon. In this experiment, it is shown that a hammer and a feather, despite the hammer being dozens of times heavier, hit the lunar surface at the same time, just as Galileo had predicted.[br][br]A few months later, NASA's preliminary scientific report humorously remarked on this result:[br][br][i][color=#0000ff][i][color=#0000ff](...) [/color][/i]a result predicted by well-established theory, but a result nonetheless reassuring considering both the number of viewers that witnessed the experiment and the fact that [b]the homeward journey was based critically on the validity of the particular theory[/b] being tested. [/color][/i]