Will space travel still primarily be using chemical propulsion rockets by 2060?
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Other options may be nuclear rockets, ion drives, solar sails, etc.
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Are we talking about crewed travel? Deep space robotic probes? Orbital launch?
@EvanDaniel I have the same question. I've seen zero alternatives to chemical rockets for takeoff, but ion drives have been very successful for smaller deep space probes, for example.
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