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Galactic Inquirer

The Search for Extraterrestrial Life, and Extraterrestrial Intelligence

28 Feb 2014, 20:52 UTC
The Search for Extraterrestrial Life, and Extraterrestrial Intelligence
(200 words excerpt, click title or image to see full post)

Martin Annis, Ph.D. (Founder – American Science and Engineering)


We have overlooked an important source of information in our search for life on Earth-like planets in the galactic Universe. There is at least one such a planet in the Universe, with information that is well known, viz. Earth. Using this planet, it is possible to establish some limits on the probability of discovering life and also of discovering intelligent life elsewhere.

The age of the Earth is about 4.5 billion years. The age of our Sun is similarly about 4.6 billion years. By comparison, the age of the Milky Way galaxy is about 12 billion years and that of the known Universe is about 13.8 billion years. Thus it is reasonable to believe that Earth is likely to be a rather common type of planet in our Galaxy and likely in other galaxies. The origin of the first single-cell life form on Earth is thought to have occurred about 3.6 billion years ago. More complex forms of life developed sequentially with finally the development of animals, apes, etc. This culminated in the origin of the branch of the tree leading to Homo ...

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