Musk aims to establish a self-sustaining human colony of one million on Mars by 2050, while Bezos dreams of enormous space stations housing trillions of humans throughout the solar system.
Experts suggest Bezos' idea of space stations is more feasible as they can be made Earth-like easier than transforming an entire planet like Mars for colonization.
Musk's vision involves terraforming Mars to make it habitable, while Bezos' approach with space stations could avoid the challenges of transforming an entire planet.
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