The phrase "rocket science" is used to describe something that is complicated or difficult to understand. It refers to the complex scientific field of designing and launching rockets into space. Full definition
So it's not rocket science here it's how to win with the players you have. (justarsenal.com)
Throughout history, statistics show teams are far stronger on their home turf than on the road it's not exactly rocket science in sport. (toddstake.com)
And, by the way, nutrition science is just like rocket science yet even more complicated. (juliedillonrd.com)