Implikationen verkar vara att de gör detta till varje planet med en smält kärna som de stöter på. Det kan påvisas att deras intresse för jorden speciellt pikades av vår aktiva (och lättillgängliga) lavakärna, i motsats till andra steniga planeter i solsystemet, såsom Mars, Venus och Mercury, vars kärnor är largely solidified.
So that was just a baby, David thought. One of probably thousands sent out into the universe to find the next feeding ground. He’d seen the growth of their technology on the level of individual organisms, but it was another thing to observe it at such a massive scale. The combination of biotechnology and advanced materials science was both intoxicating—because of the possibilities—and terrifying, because of the race that possessed it.