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Introduction. The Cosmos, the Earth, and Humankind At the Crossroads of the Improbable and the Possible Chapter 1. What if... a rogue planet grazed the Earth? Chapter 2. What if... the Earth left its orbit? Chapter 3. What if... the Earth stopped rotating on its axis? Chapter 4. What if... a 100,000-ton meteorite crashed into the middle of the Atlantic Ocean? Chapter 5. What if... the Sun suddenly went out? Chapter 6. What if... a supervolcano erupted in the United States? Chapter 7. What if... humanity fell victim to a giant solar storm? Chapter 8. What if... a neutron star hurtled towards Earth? Chapter 9. What if... a black hole the size of a soccer ball grazed Earth? Chapter 10. What if... the star Betelgeuse exploded into a supernova? Chapter 11. What if... a message of extraterrestrial origin was picked up by a radio telescope?

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