Assuming SOL travel...and if the technology and desire exists for ET's to travel to Earth, since the galaxy is billions of years old, if ET's set out their exploration 100,000 years ago, they could have arrived in the past or today...
It is just human behaviour to believe that we cannot be alone. At the moment the odds of any other life existing in the universe is zero. If even the most basic life form is found anywhere such as on one of Jupiter's moons, the odds of any intelligent life anywhere in the universe will be 100%.
What are the odds that out of a BILLION TRILLION stars in the observable Universe, and perhaps factor this by 5 for the number of planets in the Universe, that lowly Earth is the only place to evolve life forms?
Chance from 0% to 100% that's a giant jump. I personally don't think it's either of those two extremes. You come across as very rigid.
I also believe in evolution. I think life will appear wherever conditions are favorable. So, most places. But not necessarily everywhere.
welp, if there is advanced life out there and they happened upon 'the golden record', i'm 100% certain that: a) they're planning an invasion b) they've already quarantined our section of the universe as we've not seen anyone from elsewhere, i'm going with (b)
Gravitational forces cause mechanical stresses in the body of the planet, which in turn cause heating.
False and false. The odds are virtually 100%. Even if there is a one in a trillion chance, then there are others out there. And the odds appear to be very high that there billions of trillions of planets that could support life. And it was human nature to think we are alone and the center of the universe. We had to discover otherwise. And even then there were people who would execute you for even saying so. So your entire premise is fundamentally and provably false. With at least 100 billion galaxies and somewhere around 100 billion suns per galaxy, we estimate there to be around a billion-trillion stars in the universe. The chances of us being alone are one in a billion-trillion. In practical terms, there is no chance that we are alone. Note also that you are equating odds with discovery or knowledge. That is not how odds work.
It absolutely is based on science. Drake [a scientist] first estimated the number of advanced civilizations in our galaxy, in 1961. So you are only about 60 years behind actual science. It is based in ignorance. Logical extrapolations of ignorance leads to nothing.
Ah, you are referring to what you heard long ago. From whom? I seriously doubt any actual scientists were predicting dinosaurs on Venus. That sounds more like Hollywood than Harvard.
Quoting odds of one in a trillion is based on no data so it is a baseless statement. And why did you cut my post
As a young child library books were where I got my information. Not much was known. I remember telling my dad that it would be something if they found hot planetary bodies out there. And they did! I also thought it would be funny if the pryamids were poured like cement.
Possibly. We might even detect them, eventually. None of us will ever visit each other, in person. Unmanned probes might.
And they still think Venus was once inhabitable. .https://www.google.com/url?sa=t&source=web&rct=j&url=https://sea.mashable.com/science/6375/venus-had-a-habitable-atmosphere-for-millions-of-years-what-happened-to-it-exactly?amp=1&ved=2ahUKEwjVvdWRlL7nAhWEVN8KHaSQA_c4ChAWMAJ6BAgJEAY&usg=AOvVaw3ddl_pbOHng7ZSvVuUwmKA
Perhaps it's semantics...odds or probability? Mathematically when there have been zero favorable events, like an ET life form, then mathematically the odds are 0%. But odds-makers will provide betting odds on horses who have no history...perhaps this is called probability? It's possible that flipping a coin a billion-trillion *5 times will always be 'heads'. When I asked about the odds of only Earth having life forms out of a billion-trillion *5 opportunities, this was a philosophical question which is all we can expect on these topics in which we have basically zero events to support our suppositions...
Regarding evolution...we have one known favorable event here on Earth, and we can approximate the number of possibilities or opportunities in the Universe, therefore, the odds should not be 0%...
This is my reasoning for 0 or 100%: there will be many many planets/moons that will have similar conditions as Earth whether it would be favourable for carbon based lifeforms or other element. So it could be said that there will be many many of these planets where simple lifeforms will evolve. Evolution then goes on to state that intelligent life forms will then evolve. Hence to say that the probability of intelligent life elsewhere is, say 0.00001% is not reasonable. It should be 100% if you believe that simple life forms exist elsewhere. At the moment we have no evidence of life anywhere else so the probability of life elsewhere is 0%. Hopefully simple life will be found on Europa.......
I don't personally believe there are aliens, we are a one off in my mind. I see it a little bit like ghosts, if they were to exist, someone, somewhere would have proof.
I would say math and probability alone makes your disbelief seem far more like religion. You have zero proof or even probability that aliens do not exist. Meanwhile, in the case for aliens existing, we have a virtually infinite number of worlds, galaxies, even universes that exist. And you claim that this insignificant rock is the only place in this vast, endless universe that contains intelligent life? That sounds to me like priests centuries ago with their geocentric beliefs that the sun and stars revolve around the earth. I'm sure the priests thought their views were logical too.
