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It is possible, but more likely, there are others. It is possible that life (mostly of bacterial type) travels across the vast Universe on comets and asteroids. Bacterial life is very resistant, and can hibernate for thousands of years. When comet hits earth, part of debris reaches interstellar space and goes to other stars. Thus, life might spread from star to star, and it is speculated that life on Earth might come from outer space.
Other way to create life is de novo, i.e. from scratch. Abiogenesis is assumed to be not too difficult, and that it happened on thousands of planets of stars in our Galaxy. But nobody knows for sure. Our life is speculated to have come from RNA world, where RNA molecules alone, without DNA and proteins, did all the work. Then proteins got involved, and finally DNA, a much more stable chemical, was used. Some experiments show RNA evolution, starting almost from scratch. But hypothesis is that before RNA, some other chemical evolution happened. This is current thinking, but nobody knows this - it is more a hypothesis than a theory supported by solid facts. But we know much more about abiogenesis than only 20 years ago.
Other way to create life is de novo, i.e. from scratch. Abiogenesis is assumed to be not too difficult, and that it happened on thousands of planets of stars in our Galaxy. But nobody knows for sure. Our life is speculated to have come from RNA world, where RNA molecules alone, without DNA and proteins, did all the work. Then proteins got involved, and finally DNA, a much more stable chemical, was used. Some experiments show RNA evolution, starting almost from scratch. But hypothesis is that before RNA, some other chemical evolution happened. This is current thinking, but nobody knows this - it is more a hypothesis than a theory supported by solid facts. But we know much more about abiogenesis than only 20 years ago.
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None found to date. Give it time, they will probably find evidence within the next thirty or so years. Maybe sooner.
Infinite universe, no one has measured it end to end with certainty but despite not being infinite is is pretty darned large. I would say it is probable there is life out there.
There is no evidence to date that we have been visited.
Infinite universe, no one has measured it end to end with certainty but despite not being infinite is is pretty darned large. I would say it is probable there is life out there.
There is no evidence to date that we have been visited.
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No. I think there is life out there somewhere. We just need to keep looking.
SETI is looking and you can help. SETI has a FREE Screen Saver you can run on your computer.
When the SETI Screen Saver is running it examines Radio Signals from deep space that SETI has collected. There are looking for Intelligent radio signals. The screen saver is call BONIC.
http://setiathome.berkeley.edu/
SETI is looking and you can help. SETI has a FREE Screen Saver you can run on your computer.
When the SETI Screen Saver is running it examines Radio Signals from deep space that SETI has collected. There are looking for Intelligent radio signals. The screen saver is call BONIC.
http://setiathome.berkeley.edu/
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I think there are many more planets with life like earth. We have not been able to discover them yet. Perhaps when we die we will have access to these so called planets.
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Don't buy the bs there's other planets life lives on aliens live up near the atmosphere
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No.We haven't found nay yet.But we only just started exploring space.And this universe is a very big place.
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i would say yess
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No, we're not alone.