Star Trek: The Next Generation - Season 5 Episode 13 -

The Enterprise is on a mission to warn the human colony of an artificial paradisiac biosphere on planet Moab 4's southern colony of the approach of a massive stellar fragment, which will impact with seismic force causing a tectonic disaster. However its competent, considerate leader Aaron Conor refuses to evacuate, confident their biosphere can withstand earthquakes. He does allow a small Enterprise party to visit their society, which they believe far superior after eight generations of selective breeding which nearly eliminated the remaining human risk factors. ...