"

 Article in need of improvement 

A substantial part of the article,

http://en.wikipedia.org/wiki/Theory_of_impetus

concerns a ""tunnel experiment,"" as proposed by Galileo in his Dialogo.

The article would clearly benefit by having it pointed out that, although it could be, the experiment has as yet not been performed. In its original form the idea is to have a tunnel dug through the Earth so that a test object (""cannonball"") can be dropped into it. This is, of course, impossible. But the same physical principles would be revealed by using laboratory-sized massive bodies instead. The experiment could be performed in an Earth-based laboratory or in an orbiting satellite.

Articles that discuss these possibilities and present further reasons for doing the experiment can be found at:

http://astroreview.com/issue/2012/article/interior-solution-gravity-experiment

and

http://astroreview.com/issue/2012/article/the-direction-of-gravity

I have no experience contributing to Wiki, but feel this issue is important enough to learn how to do so, if this message is not sufficient to make it happen. Please advise. Thank you.

Richard Benish"