[plain talk]

Given the unfathomable distance to the nearest star, no alien biological or physical entity could ever reach earth.

Sure they could. I would state it differently - I think it is highly unlikely aliens would visit us for the reasons you mention. But it can't be ruled out. But because of these vast distances I think aliens and man will stay pretty close to their homes. It almost a certainty that man will never travel to another galaxy. It is 2.5 million light years to Andromeda.

[m422001]

With that being the closest large scale galaxy to boot,much less anything past that.

[JockoManning]

Ben Rich, retiring head of Lockheed Skunk works--that created the SR71 said that Einstein had a mistake in his equations and they knew what it was and had corrected it.

And, that we could now take ET home.