"Imagination is as vital to any advance in science as learning and precision are essential for starting points."
"Ever since celestial mechanics in the skillful hands of Leverrier and Adams led to the world-amazed discovery of Neptune, a belief has existed begotten of that success that still other planets lay beyond, only waiting to be found."
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Source: Percival Lowell, Lowell Observatory (1915). “Memoir on a trans-Neptunian planet”
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"That Mars is inhabited by beings of some sort or other we may consider as certain as it is uncertain what these beings may be."
"Bright points in the sky or a blow on the head will equally cause one to see stars."
"There are celestial sights more dazzling, spectacles that inspire more awe, but to the thoughtful observer who is privileged to see them well, there is nothing in the sky so profoundly impressive as the canals of Mars. Fine lines and little gossamer filaments only, cobwebbing the face of the Martian disk, but threads to draw one's mind after them across the millions of miles of intervening void."
"Formulae are the anaesthetics of thought, not its stimulants and to make any one think is far better worth while than cramming him with ill-considered, and therefore indigestible, learning."
"Are physical forces alone at work there, or has evolution begotten something more complex, something not akin to what we know on Earth as life? It is in this that lies the peculiar interest of Mars."