Just as astronomers rely for their information on the dim radiation coming over unimaginable distances, these other scientists are forced to rely on the traces that have survived by accident from the distant past of our planet.
Täpselt samuti nagu astronoomid toetuvad teadmistele, mida nad saavad kujutlematute vahemaade tagant tulevast nõrgast kiirgusest, peavad need teadlased lootma jälgedele, mis on juhuslikult säilinud meie planeedi kaugest minevikust.