F = GM1M2/R2 = (6.67x10-11 x 1.9891x1030 x 25) / (3000)2 =

To calculate the value of F using the equation F = GM1M2/R^2, you can follow these steps:

Step 1: Write down the given values:
- G = 6.67 x 10^-11 (gravitational constant)
- M1 = 1.9891 x 10^30 (mass of one object)
- M2 = 25 (mass of the other object)
- R = 3000 (distance between the centers of the two objects)

Step 2: Substitute the values into the formula:
F = (6.67 x 10^-11 x 1.9891 x 10^30 x 25) / (3000)^2

Step 3: Simplify the calculation:
F = (1.3279177 x 10^20) / 9000000
F = 1.4754641 x 10^10

Therefore, the value of F is approximately 1.4754641 x 10^10.