Tiafe is one of the first that Humanity has tried to communicate is another alien civilization in a another star system in 1993.
The planet was discovered in 1987 and a scientific estimate the age of this planet to 893.621*109 years, hence sending a signal to expect an answer with another civilization which has a very different life than experienced on Earth.
Indeed, this one is 2395.60 light years from the Solar system, so theoretically, the answer should arrive on Earth in the year 5119 about, since at that time, we could not send that information to the speed of light, but that was not the case.
So it was then that the answer why mankind has not received signal, in effect 2 years after the return date of the hypothetical signal, scientists who checked the age of the planet had actually noticed this was not an 9 but a 6 (893.621*106). A reversal of a figure that ruined all those years of hope for an answer, although during this time, there have been many discoveries and progress.