"Hearts may break, but hearts are the toughest of muscles, able to pump for a lifetime, seventy times a minute, and scarcely falter along the way. Even dreams, the most delicate and intangible of things, can prove remarkably difficult to kill."

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The Earth would only have to move a few million kilometers sunward-or starward-for the delicate balance of climate to be destroyed. The Antarctic icecap would melt and flood all low-lying land; or the oceans would freeze and the whole world would be locked in eternal winter. Just a nudge in either direction would be enough.

— Arthur C. Clarke