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Alan4discussion's Avatar Jump to comment 8 by Alan4discussion

Comment 7 by Agrajag

Perhaps a helpful observation would be that, while eyes have evolved more than once, they have evolved differently in (widely) different species. Also, don't forget the species such as cave-dwelling fish that have "lost" their eyes after may generations of living in total darkness. Evolution in action.

While eyes are likely to evolve in light spectral ranges, sonar as found in Cetaceans or fish-like electric field sensors could substitute in dark environments.

Anyway, apart from a few cartoons and digital constructs, Hollywood aliens have to be suitable for presentation in the form of human actors. Usually on Earth with gravity at 1G !

It's amazing how many humanoid bipeds turn up in 1G artificial gravity fields ! - Even among the robots!

Mon, 03 Oct 2011 00:21:25 UTC | #877240