human
Hitherto all attempts at space travelling have been too timid or puerile. We have experimented at aerial navigation, as if the brief span of air were a step in the mighty distance which separates us from our sister planets. As well might steamboats have been invented to cross narrow streams, and never have ventured on the mighty ocean! We have tried to imitate the bird, the kite, and the balloon, and our experiments have failed, and always must, so long as we do not look farther and think deeper. Every Icarus who attempts to overcome the force of gravity, which conquers planets, and propel himself through the air by any sort of apparatus, will always finish the trip with a wiser but badly bruised head.
gpt
Still, it has been freely predicted, I ventured,
human
And I alone have hit upon the right plan, because I have not attempted to _struggle against_ gravity, but have made use of it only for propelling my projectile!
gpt
But wait! I interposed.
human
Gravity acts only in one direction, and that is exactly opposite to the one you propose to travel.
gpt
That brings me to the very important discovery I made in physics two years ago, upon which the whole success of the projectile rests. You will remember that, according to the text-books, very little is known about gravity except the laws of its action. What it is, and how it can be controlled or modified, have never been known. Electricity was as much a mystery fifty years ago, but we know all its attributes. We can make it, store it, control it, and use it for almost every necessity of life. The era of electricity is in full bloom, but the era of gravitational force is just budding.
human
Can it be that we have as much to learn from gravity as electricity has taught us in the last half-century?