I can remember watching a Star Trek episode where the crew entered a region of space where time runs much faster than on board of the Enterprise.
At a given moment there is a planet visible, seen from outer space, and one can see that they had entered the atomic era: bright short flashes of light were seen on the surface, indicating the testing of the first atomic bombs (though it could also be that they started a nuclear conflict).
It was the Star Trek series with that female captain.