My reluctance to use alien invasion is due to the feeling that we are not likely to be invaded and taken over.
Clifford D. SimakThis is written in the elder days as the Earth rides close to the rim of eternity, edging nearer to the dying Sun, into which her two inner companions of the solar system have already plunged to a fiery death. The Twilight of the Gods is history; and our planet drifts on and on into that oblivion from which nothing escapes, to which time itself may be dedicated in the final cosmic reckoning.
Clifford D. SimakThese are the stories the Dogs tell, when the fires burn high and the wind is from the north.
Clifford D. SimakThere is a plan, it seems to me, that reaches out of the electron to the rim of the universe and what this plan may be or how it came about is beyond my feeble intellect. But if we are looking for something on which to pin our faith- and, indeed, our hope- the plan might well be it. I think we have thought too small and have been too afraid.
Clifford D. Simak