You got it right 6.67*10-11 is suppose to be 6.67*10^-11. I am attempting to create a particle simulation based on gravity between two partials. This involves using the simple gravity equation F = GMm/RČ. Where G = 6.67*10^-11. No this defiantly is not a picbasic friendly problem but it would be really cool if I could get this working because I could then easily scale this up to a large scale simulator. Cold anybody suggest a more user friendly floating point co-processor than the pricey uM-FPU, or a better way of going about this equation in code?