There is perhaps no better a demonstration of the folly of human conceits than this distant image of our tiny world. - Carl Sagan describing Earth, the Pale Blue Dot picture taken by the Voyager 1 spacecraft 6 billion kilometres away in 1990.

The Enterprise should be there (in the Smithsonian Institution) because it's the dream. The Lander is there because it's the reality, but we wouldn't have gotten the reality without the dream." - Davide Gerrold 

The planet (Earth) doesn't give a rat's ass about us. It really doesn't. It will be here long after we are extinct. So, the real question is, can we be good shepherds of this planet? - Neil Degrasse Tyson

That's one small step for (a) man, one giant leap for mankind. - Neil Armstrong
 
That may have been ‘one small step’ for Neil, but it’s a heck of a big leap for me! - Bruce McCandless       

- John Robert Powers (Secrets of Poise, Personality and Model Beauty. )