Estimate the value of the gravitational constant G inNewtons law of universal gravitation using the followingdata: the acceleration due to gravity at the Earths surface isabout 10 m/s2; the Earth has a circumference of about40 X 106m; rocks found on the Earths surface typicallyhave densities of about 3000 kg/m3 and assume this densityis constant throughout (even though you suspect it is not true).

Astronomy 101 TextBook Notes Chapter 1 Universe - the totality of all space, time matter, and energy Astronomy - the study of the universe Light Year - the distance traveled by light in a year, at a speed of 300,000 kilometers per second = 6 trillion miles Theory - the framework of ideas and assumptions used to explain some set of observations and make predictions about the real world Theoretical Model - constructed to figure out a theory. Makes further predictions about a particular object’s properties or how it will behave or change under new circumstances Scientific Method - investigation, combining thinking and doing, theory, and experiment - must be testable - must continuously be tested - should be elegant - should be simple - Occam’s Razor