rocket scientist

noun rocket scientists

1. informal An aerospace engineer who works with spacecraft. Rocket scientists have calculated that a velocity of seven miles per second, or approximately 25,000 miles per hour, would be necessary for a rocket to escape the earth's gravity.
2. excessive, idiomatic, informal One qualified to handle or understand things which are very complex or confusing; a very intelligent person. You don’t have to be a rocket scientist to see that that idea won’t work.