Adugan wrote...
Lol OP, where did you get these 1-6 points?
1. Rare is a matter of opinion. Millions of worlds is rare compared to billions in the galaxy in total.
2. Lolwat?
3. Depends on what you base that on. All we have to go on is human nature, and aliens may be too alien to comprehend, and their motivations may be different. Their technology may be different too. All their machinery may be organic for all we know.
4. Says who?
5. Again, aliens may have different motivations. You are basing this completely on human nature.
6. Probable, sure. Just like it is probable that this entire universe is a figment of someone's or something's imagination.
Ok, I guess I need to go into more detail.
1. Just google rare earth hypothesis. It's not a matter of opinion, it's a matter of lack of observational evidence. It's truth or non-truth is independant of anyone's opinions. Earth-like planets may be rare or non-rare, we just don't have enough data yet. Part of this goes into possibility 2. The sun is not a very common star, like was previously assumed. Most stars like the sun are part of binary systems, and such systems make planetary orbits very unstable. As far as yellow dwarf stars that are not binary, our sun is very interesting. Just a tiny fraction more mass, like 10% more mass, our sun would have a lifespan of 4 billion years. Complex life didn't evolve until the sun was about 4 billion years old, meaning such a sun is unlikely to produce a space-faring civilization. Finally, we have night and day thanks to our huge moon, and the unusual circumstances under which it was formed (giant impact theory). An earthlike planet orbiting around any star like ours is likely to have an unstable axis and it's days would be so long that one side would scorch, the other freeze. Plate techtonics would stop working, and it would lose its magnetic field within a billion years. All of this makes it unlikely that any earth-like planet in the habitable zone circling around a sun-like star would harbor any life without something like our moon, and the probability of something like our moon be created around an earthlike planet is unknown, but we can probably safely bet that such circumstances should be very, very rare.
2. This one is tied to 1 because, like I said, an earth-like planet with something like our moon revolving around something like our sun is probably rediculously rare. However, it might be more common that life revolves around red dwarfs. Red dwarfs are the most common type of star in our galaxy, but an earthlike planet revolving around such a star would be tidally locked, with one side always facing its sun. Perhaps a large moon could be created around such a planet from a giant impact, giving the planet spin. It's more likely that a gas giant could settle in the habitable zone around such a star and one of its large moons could harbor life. Living moons might be more common in the universe than earth-like planets. Therefore, civilization that arise would look for life within red dwarf stars containing gas giants in the habitable zones. Most civilizations might ignore sunlike stars because, as I've already mentioned, such stars are unlikely to harbor life, but red dwarfs might be more likely to harbor life.
3. As for this one, all we have is human nature. However, scientists have used the notion that we're nothing special and usually have been proven right. More than likely, a civilized species would evolve from a predatory species because predators must be smarter than their prey. Likely they will also have territorial instincts as well. A species with predatory instincts is far more likely to be hostile than a non-predatory species, but non-predatory species are not likely to become sentient.
4. Says our own dependance on technology. Eventually we get implants to make us stronger. Perhaps a little genetic engineering. We start replacing more and more of our bodies with tech until we replace our own brains with tech. Eventually we BECOME tech. Instead of the sci-fi notion that synthetics wipe out organics, it's more that we become synthetics. As synthetics, we'd have no need of earthlike planets at all, because as synthetics, we don't need to eat biological food. Instead we just get energy directly from solar radiation and all the resources we need from mining asteroids and such.
5. See explanation number 3
6. See explanation number 3. If humans have a tendancy to be selfish @ssholes, what makes you think that other civilizations would NOT be selfish @ssholes?
Paradox solved. I'll be here all week.
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