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Although no extraterrestrial life has been found and life may still be just a rarity from Earth, there are scientific reasons to suspect that it can exist elsewhere, and technological advances that may detect it if it does. [152] Many scientists are optimistic about the chances of finding alien life.
The famous Drake equation allows us to estimate how many alien civilizations might exist in the Milky Way. It looks like this: N=R*(fp)(ne)(fl)(fi)(fc)L, with each variable defined below.
Intelligent civilizations exist, but we see no evidence, meaning f c is small. Typical arguments include that civilizations are too far apart, it is too expensive to spread throughout the galaxy, civilizations broadcast signals for only a brief period of time, communication is dangerous, and many others.
Recently, paleobiologist Olev Vinn has suggested that the great filter may exist between steps 8 and 9 due to inherited behavior patterns (IBP) that initially occur in all intelligent biological organisms. These IBPs are incompatible with conditions prevailing in technological civilizations and could inevitably lead to the self-destruction of ...
What makes someone believe that aliens exist? Experts say there's more to it than many people think.
The thin band between perpetual night and day, known as a termination zone, could have just the right ingredients for life to flourish.
Grey-skinned (sometimes green-skinned) humanoids, usually 1 m (3.3 ft) tall, hairless, with large heads, black almond-shaped eyes, nostrils without a nose, slits for mouths, no ears and 3–4 fingers including thumb. Greys have been the predominant extraterrestrial beings of alleged alien contact since the 1960s. [5] Hopkinsville goblin [6] [7] [8]
2012: In the sci-fi video game Star Citizen, the zoo hypothesis is vaguely referenced in a lore point and is referred to as the Fair Chance Act. In the document, humans are generally forbidden from terraforming , mining, and inhabiting planets if the world is found to harbor lifeforms capable of developing intelligence.