“ Asteroids and comets hit us but not excessively so, thanks to the presence of giant gas planets such as Jupiter beyond us, ” explain scientists Peter D. Ward and Donald Brownlee in their book Rare Earth ​ — Why Complex Life Is Uncommon in the Universe.
„ Tänu gigantsete gaasiliste planeetide, nagu meist kaugemal asuva Jupiteri olemasolule asteroidid ja komeedid küll tabavad meid, kuid mitte kuigi sageli, ” selgitavad teadlased Peter Ward ja Donald Brownlee raamatus „Rare Earth – Why Complex Life Is Uncommon in the Universe ”.