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Physics never does an about face. Whatever new physics is out there must be compatible with the physics that we know and use today. And we know enough about physics at planetary and solar system scale phenomena to know that UFO-type intelligent aliens visiting us is a physical impossibility.

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> Physics never does an about face. Whatever new physics is out there must be compatible with the physics that we know and use today.

According to who? How is that compatible with the history of physics?

How isn’t it compatible? Einstein didn’t overthrow Newton, he just clarified what happened at high speed and high energies.

There are a few cases where physicists found new capabilities which weren’t known before, like Faraday discovering induction, or Einstein discovering mass-energy conversion. But even then the basic principle of energy being conserved is respected, and physical limits obeyed.

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