Some of the first Alien novels feature the space Jockys. They destroy or render the aliens disabled when they took over Earth with some kind of sonic blast mechanism.
It is speculated that the Jockey on the derilict was alone on his his journey, it was a cargo ship, delivering a batch of Xenomorph Eggs to an unknown destination when the protective barriers were breached and a facehugger managed to Escape, latching itself onto the Jocky, sealing his fate, it was then that the pilot made an emergency landing on the nearest planet, whilst sending out a distress singnal as a warning to anyone who would come close to Acheron (LV4-26)
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