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One of the challenges is that space is really big.

And so, you know, to be able to travel even within our solar system is very challenging.

And outside of our solar system is essentially like impossible with a new human lifetime.

And so, you know, for like crafts to show up here,

one thing that we'd be assured of essentially is that they'd be from outside the solar system.

Otherwise, we wouldn't have actually detected them already.

Which means that they have solved like a major challenge in propulsion.

Which probably also means that they've solved them to energy challenges too.

Right? Because you don't like spend a whole lot of your resources going out into space

...