This is the modern version of 1700s common wisdom: "A vehicle would have to be much too light to travel through the air. Otherwise it would need an unfathomable

This is the modern version of 1700s common wisdom: "A vehicle would have to be much too light to travel through the air. Otherwise it would need an unfathomable amount of energy. And if it tried to go too far up, it would enter the ether!" Advancement seems to grow at exponential rates. Perhaps in a 1000 years we will not see c as an impediment.