I'm not a cat
- Jan 10, 2021
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That is based on our technology and our interpretation of physicsI look at it from the opposite direction. In a few hundred years we may be capable of building craft that could travel to other stars. These craft would need to use gigantic amounts of power to accelerate each kilogram to a reasonable interstellar speed, but even so they would take decades en route. We are talking about the entire generated energy budget of the Earth to accelerate a craft the size of a Volkswagen to 0.1c.
To conserve enough energy for the deceleration phase, we would need to reduce the mass of the craft on route, so that the travellers would arrive in a tiny capsule with minimal resources to spare.
Far from threatening us with their superior resources, any aliens with foreseeable technology will arrive with practically nothing in reserve, and need our help much more than we need them.