Pale Blue Dot: A Vision of the Human Future in Space

“Sagan's reflection on Earth's smallness from the Voyager photograph is a direct ancestor of Musk's Mars reasoning. He has quoted or paraphrased its core argument — that a species confined to one planet is inherently fragile — in the context of SpaceX's mission more than once.”

“Sagan's later and more philosophical book is, if anything, more central to The Marginalian than Cosmos. The famous 'mote of dust suspended in a sunbeam' passage appears in her posts so often it has become a kind of recurring refrain for the site.”