http://1-formula.com/physicians-formula/gravitation.html Gravitation is the natural force of attraction that acts between all objects because of their mass. Earth has big force of gravitation en-us Sat, 11 Oct 2008 21:44:09 GMT Tue, 3 Mar 2009 08:52:48 GMT www.1-formula.com www.1-formula.com http://1-formula.com/physicians-formula/gravitation/gravitation-laws-gravity.html Towards the end of the sixteenth century, Tycho Brahe collected a huge amount of data giving precise measurements of the position of planets. Johannes Kepler, after a detailed analysis of the measurements announced three laws in 1619. Tue, 3 Mar 2009 08:52:48 GMT http://1-formula.com/physicians-formula/gravitation/gravitation-laws-gravity.html