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Earth orbits the Sun at 149.6 million kilometers. 5% closer—just 7 million kilometers—and the oceans would boil away like Venus. 5% farther—just 7 million kilometers—and the planet would freeze like Mars. The margin between paradise and hell is 14 million kilometers. In a solar system 287 billion kilometers across, that's razor-thin. But distance is just one variable. You also need a circular orbit, the right stellar type, the correct planetary mass, proper atmosphere, magnetic field, and plate tectonics. Earth threads the needle through every single parameter. Step outside any range, and life becomes impossible. Venus is 5% closer. Runaway greenhouse, 475°C surface, sulfuric acid clouds. Mars is 5% farther. It lost its magnetic field, its atmosphere was stripped away, and it became a frozen desert. Thank you for watching. ❤️ More episodes coming soon. #GoldilocksZone #HabitableZone #Earth #RareEarth #Exoplanets #PlanetaryScience #Astrobiology #SolarSystem #SpaceScience #Astronomy #FermiParadox #FineTuning #CosmicGoldilocks #spacedocumentary Echoes of Time v2 by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/... Source: http://incompetech.com/music/royalty-... Artist: http://incompetech.com/