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“They say that even the brightest star won't shine forever. But in fact, the brightest star would live the shortest amount of time. Feel free to extract whatever life lesson you want from that.”
― Philip C. Plait, Death from the Skies!: These Are the Ways the World Will End...

“I am using the word theory as a scientist means it: a set of ideas so well established by observations and physical models that it is essentially indistinguishable from fact. That is different from the colloquial use that means "guess." To a scientist, you can bet your life on a theory. Remember, gravity is "just a theory" too.”
― Philip C. Plait, Death from the Skies!: These Are the Ways the World Will End...