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Thread: Life on other planets?

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    I'm sure there is life on other planets but I doubt that any of us will be alive if contact is made.

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    I'm sure its possible. in anothe galaksy

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    Given hundreds of billions of galaxies, each with hundreds of billions of stars and planets, it does seem quite implausible that out of all those many quadrillions of planets, Earth is the only planet with life. There are only about 80 stable (non-radioactive) elements in the universe. They are all found on earth and probably on countless other rocky planets. About 25 of those elements are essential to human life, and it is likely to be similar for complex life elsewhere in the universe.

    So, the ingredients for life are widespread in the universe. The problem is we don't know exactly what conditions are required for life to start on a planet, or how rare or common those conditions are on other planets. For example, it has been argued that protection from cosmic radiation is necessary for life to begin, and that Earth has that protection because its iron core produces a magnetic field that deflects the sun's cosmic radiation. Some argue that a large moon such as our moon is necessary to stabilize the planet's rotation, and the surface temperature range. Liquid surface water is usually said to be another necessary pre-condition for life. Even if all that is true, and even if there are other pre-conditions for life we don't even know about, such that only one in a billion planets has the necessary conditions for life, that would mean that there are hundreds of other planets with life in the Milky Way alone, and trillions more in other galaxies.

    Given simple life on a planet, the other interesting question is how often, and on what time scale, does life evolve from simple to complex to intelligent life with space technology. Life on Earth has existed for about four billion years, but life with space technology for only a little over one hundred years. I'm taking radio transmissions into space as the beginning of the age of space technology, and those transmissions began around a hundred years ago. If the ratio of four billion to one hundred is taken as a rough indication of the probability of any life relative to the probability of life with space technology, then only one planet in forty million with life might be expected to have life with space technology. So, even if there are a million other planets with some form of life in the Milky Way, ours might be the only planet in our galaxy that is capable of sending and receiving messages from other planets at this point in time. Our technology is much too recent for our messages to have reached other galaxies, and we could only detect messages from other galaxies, even nearby galaxies, if those messages were sent millions of years ago, perhaps by a civilization that no longer exists. We shouldn't be too surprised that we have no evidence yet of intelligent life elsewhere.

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    There is a billions planets even more, so I'm sure that there even 0.0000000000000000000000000000000001% but exist

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    Life already existed on mars

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    Quote Originally Posted by Wanderer View Post
    Life already existed on mars
    Until fossil evidence is found there, that is conjecture. It will remain an open question until Mars is studied more thoroughly.

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    Quote Originally Posted by Tamakore View Post
    Until fossil evidence is found there, that is conjecture. It will remain an open question until Mars is studied more thoroughly.

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    hello,

    I think we are a like a man alone in the dessert, blinded by sun and endless sand. He would feel as if he was the only living thing. In truth, he is surrounded by life of endless forms and numbers scattered not only in physical space but an endless amount of time.

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    in my opinion yeah I'm sure there's life out there but I don't think it's super intelligent and technologically advanced though, I hope I am wrong though maybe we will pick up a signal from them someday.

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