precision of the values of gravitational constant G

1. The problem statement, all variables and given/known data
What are the magnitud of G (gravitational constant) and the age of the solar system in CGS system of units and in seconds respectively? and what is the precision of these values and why?

2. Relevant equations

3. The attempt at a solution
I found that the value of G in CGS system is 6.674 X 10-8 cm3g-1s-2(approximately) and the age of the solar system is 4600 million years and in secons is : 1.450656 X 1017 seconds (approximately)
So my question is: what is the precision of these values? and why? do I need to put the uncertainities? I also found that the gravitational constant has a precision of 1 over 10,000 but why? so I really would appreciate your help 🙂

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