Re: G the gravitational constant

BernardZ wrote:
I was looking at the units of G - M^3/(S^2*kg)

Well, it has those units in MKS. Other systems of units are common. In GR the most common units have G=1 -- it is unitless. The second most common units set G=1/(8pi) and again it is unitless.

	We also set c=1 (unitless), which means in GR the only unit
	is length, and cm is most common. This means that time, energy,
	mass, and momentum are all measured in cm.


And I was curious as to whether the value of G ( the gravitational constant) be the same to different observer in different frames of reference.

In GR, G is a constant, and as such is of course completely independent of any coordinates, be they a reference frame or other construct. Its units, however, are conventional; different observers can use different conventions.


Tom Roberts	tjroberts@xxxxxxxxxx
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