Question

What is the difference between small g and capital G ?

Answer 1

g_ gravity in earth
G_ all over gravity in space

Answer 2

g is the acceleration due to gravity in which particle is thrown upwards offers a force(mg) downward towards the centre of earth..and the very special thing about g is that it vary place to place it is zero at the centre of earth and it have maximum value at poles..
value of g = 9.81m/s^2 or 10 m/s^2
G is the universal constant also called ' universal constant' its value is absolute ...it means that it does not change from place to place it is constant in anywhere in the universe...
value of G = 6.67 × 10^-11 Nm^2/kg^2