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Full Version: Alien Life may be our doom
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Why would the discovery of extraterrestrial life be horrible for life on earth?

The latest Kurzgesagt – In a Nutshell video says there are 10 billion earth-like planets in the Milky Way. If they have or had life on them they should have colonized the galaxy. The fact that they haven't means that either we are alone in the galaxy or there is some kind of deadly "filter" (nuclear war, nanotech, AI, resource depletion) that wipes out advanced life before it's able to colonize the galaxy.

Since the Universe is big and old, and life on Earth didn’t take relatively long to evolve, then life should be everywhere in the Universe. And yet, no matter how hard we look, we don’t see any evidence of it out there, not on Mars, not sending us radio messages, and not taking over entire galaxies and using up all their energy.

This, of course, is the Fermi Paradox, and it’s an absolutely fascinating concept to think about. There are many possible resolutions to the Fermi Paradox, but most of them are unsatisfying. Sure, we could be living in a cosmic zoo, or we fundamentally misunderstand how difficult it’ll be to travel to another star.

And maybe we’re just the first lifeforms in the observable Universe that have reached the level of technology that can conceive of exploring the Universe. But then, what are the chances of that? That really seems unlikely.

But then there’s the idea of the Great Filter. That there’s some kind of event that affects every single intelligent civilization, stopping it from reaching out into the galaxy, sending out signals, and exploring other worlds. Something wipes them out every time.
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Conditions on our green and pleasant planet which we are adapted to is most likely to be quite toxic to life which evolved on other planets.

Our solar system is atypical, we orbit close to our star, this is not the case in most other solar systems where the gas giants orbit close to their star -

Gas-Giant Exoplanets Cling Close to Their Parent Stars

Gemini Observatory’s Planet-Finding Campaign finds that, around many types of stars, distant gas-giant planets are rare and prefer to cling close to their parent stars. The impact on theories of planetary formation could be significant.

In the light of this we could surmise that radiation levels on the surface of our planet would be too high for the majority of extraterrestrial beings.

Our atmosphere and chemical composition could be toxic not to mention components in our atmosphere such as pollen, dust etc.

Even water - relative humidity could be too high for aliens to breathe (if they do breathe) this is what is found with some caves on Earth where without breathing apparatus you would drown.