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> I think if we ever see an alien, he will either fly to us in a completely enormous nuclear rocket which we will spot years before his arrival and deceleration.

I think that they will teleport here and be minuscule and invisible (at first).

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That's the point. If you will ever see a martian on your porch, and you haven't seem a giant nuclear rocket on which he came here, it will be the most direct proof that we missed something really big in our physics theories, something on the level of 5th force, existence of negative mass, or quantum gravity being a thing.

Or magic.

At that point, if our physics models are that wrong, you might as well say a wizard could have done it.

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