My reluctance to use alien invasion is due to the feeling that we are not likely to be invaded and taken over. It would seem to me that by the time a race has achieved deep space capability it would have matured to a point where it would have no thought of dominating another intelligent species. Further than this, there should be no economic necessity of its doing so. By the time it was able to go into deep space, it must have arrived at an energy source which would not be based on planetary natural resources.
Clifford D. SimakMuch of what we see in the universe ... starts out as imaginary. Often you must imagine something before you can come to terms with it.
Clifford D. SimakIt seems to me, thinking of it, that there must be some universal plan which set in motion the orbiting of the electrons about the nucleus and the slower, more majestic orbit of the galaxies about one another to the very edge of space
Clifford D. SimakYou still could go to some industry or some university or the government and if you could persuade them you had something on the ballโwhy, then, they might put up the cash after cutting themselves in on just about all of the profits. And, naturally, they'd run the show because it was their money and all you had done was the sweating and the bleeding.
Clifford D. Simak