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Cosmic Expansion is a category for books that explore the widening horizons of the universe and our place within them—spanning rigorous nonfiction on cosmology, dark energy, and the accelerating expansion of space-time; visionary futurism about interstellar travel and civilization-scale engineering; and sweeping fiction that follows humanity (or other intelligences) as they push beyond planetary boundaries into galactic eras. Whether hard science, space opera, or philosophical speculation, these works dwell in vast scales of time and distance, wrestle with existential questions raised by an ever-growing cosmos, and evoke the awe, peril, and possibility of expanding frontiers—both outward into the stars and inward into consciousness.

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