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Is there life out there?
Most star systems do not have planets with stable orbits and consistent temperatures to permit the evolution of life. The nearest one similar to the sun, Tau Ceti, has now been found to have a massive band of debris which likely includes numerous comets which would cause numerous catastrophic collisions on any earth-sized planet.
The most numerous stars are red dwarfs like Proxima Centauri which probably don't give off enough heat to sustain life on an orbiting planet, others are red giants which have expanded and encompassed any planets they may have had.
Most stars are parts of multiple star systems which cannot have planets with stable orbits. Then there are the supergiants like Rigel and Deneb, which "live" only a few million years before exploding into supernova.
Many stars have massive flares which would have a huge effect on orbiting inner planets. The sun is unusually stable, it does have flares but not any large enough to destroy life on earth.
Despite that, simple life forms are probably very common throughout the universe.
More complex life forms, which requires a much longer time to evolve, are likely comparably rare.
Intelligent life - which in order to evolve requires many million years of relatively stable conditions - is probably very, very rare but it likely exists somewhere out there.
We are a very special species on a very special planet.
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Originally posted by Freedom! View PostIs there life out there?
Most star systems do not have planets with stable orbits and consistent temperatures to permit the evolution of life. The nearest one similar to the sun, Tau Ceti, has now been found to have a massive band of debris which likely includes numerous comets which would cause numerous catastrophic collisions on any earth-sized planet.
The most numerous stars are red dwarfs like Proxima Centauri which probably don't give off enough heat to sustain life on an orbiting planet, others are red giants which have expanded and encompassed any planets they may have had.
Most stars are parts of multiple star systems which cannot have planets with stable orbits. Then there are the supergiants like Rigel and Deneb, which "live" only a few million years before exploding into supernova.
Many stars have massive flares which would have a huge effect on orbiting inner planets. The sun is unusually stable, it does have flares but not any large enough to destroy life on earth.
Despite that, simple life forms are probably very common throughout the universe.
More complex life forms, which requires a much longer time to evolve, are likely comparably rare.
Intelligent life - which in order to evolve requires many million years of relatively stable conditions - is probably very, very rare but it likely exists somewhere out there.
We are a very special species on a very special planet.
Comment
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