It was fifty years ago, on April 12, 1961, that Yuri Alekseyevich Gagarin became the first human being to orbit the Earth.
Perhaps because the technology had reached its limits, or because what was found in space wasn't quite what we hoped, but for whatever reason, after the 1960s humanity turned inward. Can't say we're any better off for it.
For that one short stretch of time, we reached for the stars. Maybe we'll do so again some day.