Published: 11:20 AM 12/20/2010
Weíve all seen Hollywood aliens Ė the classic little green man with the big head, black eyes and flying saucer is forever indelibly imprinted on our brains, and when we think about alien life, thatís inevitably the mental picture that we get.
But is it possible for us to scientifically work out a better idea of what aliens would like look like?
Assuming that alien life is, like us, carbon-based and needs water to survive, then itís entirely possible that it would look substantially like we do.
This is because intelligent life is going to need three-dimensional vision (for this you need eyes with overlapping fields of vision, at least two), a way to communicate through sound, at two arms with hands for gripping things and using tools, at least two legs for getting aroundÖ Itís possible to see that while things like color, coverings like hair or fur, and proportions could differ a lot, there are some basics that an intelligent life form couldnít do without.
So this is an argument for alien life that is humanoid.
On the other hand, itís possible that this assumption that alien life would have to look roughly likely us is a failure of imagination on our part, and maybe the similarities would actually be relatively few. One needs only to look at the animal kingdom in order to see the massive variety of successful life forms that can arise even among carbon-based life forms inhabiting a planet like ours.
Carbon and water are chemically such great building blocks for life that itís very likely that alien life will also be constructed from these elements. So we can say that ancient astronauts looked like aliens In previous times.
†However, the other possibility is that alien life might exist that isnít carbon based and water-requiring like we are. This concept is so Ďaliení to us that itís hard to even conceive what a non-carbon-based being could look like. Silicone-based life forms from a sulphuric-acid rich planet? Our imaginations fail us here.