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FAQ Policy. About this book What does existing scientific knowledge about physics, chemistry, meteorology and biology tell us about the likelihood of extraterrestrial life and civilizations? Show all.
Astrophysical Factors Pages Halley, J. Planetary Considerations Pages Halley, J. Biological Factors Pages Halley, J. Colonization and Panspermia Pages Halley, J.
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SyFy Wire. The signal repetition rate, for example, is tricky to handle in the model.
How Likely is Extraterrestrial Life?
Continuous signals are easy to deal with, but signals that repeat rarely are difficult. One relevant example is the famous Wow! But despite various attempts, this signal has never been observed again. That may be because it is entirely spurious, but it may be because the repetition rate is so low.
Defining the size of this cosmic haystack is then the task of adding all these spaces together. The result is a space of truly gargantuan proportions. But how much of this have astronomers explored? Wright and co say that the searches to date have covered just 5.
To put this in the context of Tarter et al. So the total search to date is equivalent to searching 7, liters of seawater.
Clearly, there is plenty more searching to be done, even though the task seems more daunting than ever.
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