"Who's doing it? Prime Base?"
"Yes. Enough men will be thrown in here to do the whole job in an hour."
"That is good news. Clear ether, Lensman!" And the base commander went back to his post.
As the air-lock toggles rammed home, sealing the exit behind the departing visitor, Kinnison eased his speedster into the air and headed for Valeria. Since the two vessels ahead of him had left atmosphere inertialess, as would he, and since several hundred seconds had elapsed since their take-off, he was, of course, some ten thousand miles off their line as well as being uncounted millions of miles behind them. But the larger distance meant no more than the smaller, and neither of them meant anything at all to the patrol's finest speedster. Kinnison, on easy touring blast, caught up with them in minutes. Closing up to less than one light year, he slowed his pace to match theirs and held his distance.
Any ordinary ship would have been detected instantly—long since, in fact—but Kinnison rode no ordinary ship. His speedster was immune to all detection save electromagnetic or visual, and, therefore, even at that close range—the travel of half a minute for even a slow space ship in open space—he was safe. For electromagnetics are useless at that distance; and visual apparatus, even with subether converters, is reliable only up to a few mere thousands of miles, unless the observer knows exactly what to look for and where to look for it.
Kinnison, then, closed up and followed the Prometheus and her mauler escort; and as they approached the Valerian solar system, sure enough, the recall messages came booming in. Also, as had been expected, the renegade captain of the freighter sent back, first his defiant answer, and then his message to the pirate high command. The mauler turned back; the merchantman kept on. Suddenly, however, she stopped, inert, and from her ports were ejected discrete bits of matter—probably the bodies of the Boskonian members of her crew. Then the Prometheus, again inertialess, flashed directly toward the planet Valeria.
An inertialess landing is, of course, highly irregular, and is made only when the ship is to take off again immediately. It saves all the time ordinarily lost in spiraling and deceleration, and saves the computation of a landing orbit, which is no task for an amateur computer. It is, however, dangerous.
It takes power, plenty of it, to maintain the force which neutralizes the inertia of mass, and if that force fails, even for an instant, while a ship is upon a planet's surface, the consequences are usually highly disastrous. For in the neutralization of inertia there is no magic, no getting of something for nothing, no violation of Nature's law of the conservation of matter and energy. The instant that force becomes inoperative the ship possesses exactly the same velocity, momentum, and inertia that it possessed at the instant the force took effect.
Thus, if a space ship takes off from Earth, with its orbital velocity of about eighteen and one half miles per second relative to the Sun, goes free, dashes to Mars, lands free, and then goes inert, its original velocity, both in speed and in direction, is instantly restored, with consequences better imagined than described. Such a velocity, of course, might take the ship harmlessly into the air; but it probably would not.