Aerospace technology plateaued decades ago. There was a rapid improvement from 1920 to 1970, and since then we aren't any closer to colonizing the solar system than we are today.
You see this pattern all over the place (exponential growth followed by a plateau). Medical technology, for example, as impressive as it is is really only improving at the margins today. In the 40 years between 1970 and 2010, life expectancy at birth for whites has gone up around 5 years. In the 40 years before that, it went up 10 years. In the 40 years before that, it went up almost 20 years.
You see this pattern all over the place (exponential growth followed by a plateau). Medical technology, for example, as impressive as it is is really only improving at the margins today. In the 40 years between 1970 and 2010, life expectancy at birth for whites has gone up around 5 years. In the 40 years before that, it went up 10 years. In the 40 years before that, it went up almost 20 years.