""Killer asteroids are nature's way of asking, 'How's that space program coming along?'" - Anonymous"
— Space exploration

January 1, 1970

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Added on April 10, 2026
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TechnologyOuter space
Original Language: English

Sources

Headline quote at the beginning of Chapter 3, "Mining the Heavens," in Michio Kaku's book, The Future of Humanity: Terraforming Mars, Interstellar Travel, Immortality, and Our Destiny Beyond Earth (2018), page 54. Doubleday, a division of Penguin Random House. ISBN 9780385542760.