What is the difference between rocket science and social science?

A Indian Civil servant writes: 

“It is the presumption that the science of economics is somehow subject to some universal, natural laws which is the issue.  

Economists, after all, were the awesome rocket scientists of the social sciences, complete with calculus, regressions, complex equations and econometric models.

 ……..the discipline of economics from the jaws of rocket scientists and mathematicians and handing it back to macro-economists, economic historians and political-economists. Social scientists need to reclaim the dismal science and spruce it up."