Is anyone out there

Is Anyone Out There?
Throughout the years, the alien has been one of the most popular topics in science fiction movies and books. In fact, a lot of people are getting interested and would like to know if there is really another kind of living creature out there in space. What do they look like? Where are they coming from? Will they come and attack Earth? All these questions are the most frequently asked by the general public.
The main question that interests astronomers is whether there is anyone out there in space. Scientists are trying to search for life that may exist elsewhere in the universe by using instruments and different ways to communicate with extraterrestrial life. As no evidence has proven that there is or there isn’t, this seems to be a very open question.
Some astronomers worked on the above question by attempting to estimate the number of advance technical civilizations in the Milky Way galaxy. They require assigning numerical values to quantities such as the number and age of stars; the abundance of planetary systems and the likelihood of the origin of life within them; the probability of the evolution of intelligent life and the lifetime of technical civilization. Results indicated that there were around a million technical civilizations in our Galaxy alone. This may seem to be such a large number. But there may be as many as 250 billion stars in the Milky Way Galaxy. Even with a million civilizations, less than one star in 250,000 would have a planet inhabited by an advanced civilization. Since we have little idea which stars are likely candidates, we will have to examine a huge number of them. (Sagan, 1979)
If there are a million technical civilizations in the Milky Way Galaxy, the average separation between civilizations will be about 300 light years. (Sagan, 1979) If this assumption is correct, the time to communicate back and forward between two civilizations would be 600 years. As we can see it takes a very long time to communicate and it is most unlikely that we will get any result back within our human life time since humans only started to send messages to outer space in the 1970’s.
The first message that was attempted in 1974 by Frank Drake, he was the pioneer of the Search for Extraterrestrial Intelligence (SETI) Institute. Dr. Drake’s message to the stars was beamed from the Arecibo radio telescope in Puerto Rico. It contained just 1,679 bits of information. It consisted of a rectangular grid that aliens could reconstruct to provide a crude diagram of the solar system and of a DNA double-helix molecule, along with a smattering of other information. (Chandler, 1999)
A recent message that was sent to outer space utilized a similar concept. Yvan Dutil and M. Stephane Dumas of the Defence Research Establishment Valcartier near Quebec City constructed a 22 page message which included several pages about mathematics and basic physics, a few about biology and geography, a diagram, some basic data about our solar system and a request to the recipients to send back some information about the world they call home. (Chandler, 1999)
The reason to send such data is that scientists believed that mathematics and science are the two universal languages that the aliens should be about to understand if their civilization is advanced enough.
Attempts to detect radio signals began in the early 1930’s when Karl Jansky constructed a radio telescope, which started to detect radio waves from outer space. (Sagan, 1997) However, until this point, with all the improvement of our technology, we still cannot find any signal received from another civilization.
The detection of radio signals from space would indicate that the origin of life is not an extraordinarily unlikely event. It would prove that simple forms of life do generally evolve into complex and intelligent forms, as on Earth. The most likely case is that the message will be form a civilization which the same level or even far superior technology. Such message will deliver an invaluable piece of knowledge: it is possible to live through technological adolescence, avoid technological disaster or even clear out the differences among human beings or separate races and nationalities, religions and sexes and help ally the whole world together against the extraterrestrial