This is a surprisingly unpoular message Instead of being relieved that we can't be invaded by hostile aliens people are disturded by the idea that our technology is approaching some theoretical limit so soon after it fist started Only 160year separate the first steamlocomotive fome manned space flight a stupendous rate of progress Surely if technology could take us from 3milrd per hour to 25,000miles per hour in only160 year someday speeds in excess of 186 miles per second should be possible