Why Tau Ceti and Epsilon Eridani was selected to target for Ozma message?
The "Project Ozma" (1)from the year 1960 was the first attempt to make contact with other civilizations. It was the pilot experiment for the SETI (2)-program and another kind of interesting stuff. When this program was failed to making the contact, that means that things like searching the exoplanets got the scientific basement, and at that time, we didn't have a single observation of the exoplanet. Today we know thousands of exoplanets, and maybe we would make contact with another civilization.
The famous "Ozma" message to another star was sent to Tau Ceti (3) and Epsilon Eridani (4). The attempt was to make contact with super civilizations, and the idea was that those stars and their solar systems were so different than our own that those civilizations would not threaten us. If the solar system would not have oxygen, there would be no water and the "Ozma" researchers thought that they could find the civilization, what would be the silicon-based, what means that the hypothetical civilization would not even want to land on our planet.
Epsilon Eridani was another object, where the scientists send so-called "Ozma-Message". The thing is that the Epsilon Eridani is too young to be the home of the advanced civilization is putting brakes to those people's operations, who are working with SETI-program.
And sometimes people would ask, why those researchers selected the Epsilon Eridani to target for "Ozma-message"? The star was too young for the intelligent civilization, and the answer would not even be hoped to get.
If the answer to Ozma-message would come near the young star, that means the answerer is the colony of a very advanced civilization. "Ozma" was projected, what mission was to look for intelligent and advanced civilizations. And it was the pathfinder for a modern way to make science. Today we know that most of the stars might have some kind of planets around them, and the thank to this thing would belong to the "Ozma"-team.
The dust and ice makes difficult to see the planets near Epsilon Eridani
They opened the eyes of the people to see, that there would be something, that we don't know. In modern times the way to make science is that the team would research and make observations before we would not laugh or punch anybody. The thing is that the Tau Ceti, Epsilon Eridani, and Alpha Centauri have at least suspected planets orbiting them. And the Tau Ceti and Alpha Centauri (5) have confirmed planets, and Epsilon Eridani has suspected followers. The disk of dust and ice makes difficult to see planets, what are orbiting it.
So the answer is that the scientists thought that if the answer for those messages would come from Epsilon Eridani, the hypothetical answer to out message would come from the transmitter from the very advanced civilization. This hypothetical civilization had the technology, which allows them to create colonies to another star system.
And if the answer would come near the young star, that must be the colony, what will answer to the message, what the scientists have sent. The target stars would be carefully selected, because "Ozma" was looking for intelligent and advanced civilizations. So the thing, what those people had to find was the star, where is no planet, what has endemic lifeforms.
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