Doomsday will come

Charles Berlitz : linguist, language teacher
"Although the idea of piloted UFOs and intelligent life in space is usually considered with a certain amount of sardonic humor, it nevertheless remains a possibility and should be considered as an added opportunity for Earth's peoples, through knowledge of its drive and methods, to develop another means of escape from our environment if or when it becomes untenable."
"Our legends from an earlier world tell us of a great ship or ships which provided a refuge in far places of the earth, but perhaps after the next catastrophe Earth itself may become inimicable to humanity. Our survival plans should therefore be predicated on an intensified exploration of space; not only to find a refuge but also to expand our observation of the universe, to be able thereby to avoid or control dangers within the cosmos which may even now be drawing closer to Earth."

Berlitz, C., (1981) "Dooms-Day 1999 A.D.", Doubleday