Do Aliens Exist?
Alien Life in the Universe

Alien Life in the Universe
Do Aliens Exist? (CNN - Nov 26th, 2008) - "Are we alone?" It's a question that's been debated for decades. CNN's Susan Hendricks has the viewer reaction. Do aliens exist or is it just pure science fiction?

The Roswell UFO Incident was the alleged recovery of extra-terrestrial debris, including alien corpses, from an object which crashed near Roswell, New Mexico, in July of 1947.

Since the late 1970s the incident has been the subject of intense controversy and the subject of conspiracy theories as to the true nature of the object which crashed.

It is theorized that any technological society in space will be transmitting information, although this is arguable, as there are generally no human systems intentionally, randomly, transmitting information into deep space, so there is no guarantee that any other species would do so, either.

Also, the length of time required for a signal to travel across the vastness of space means that any signal detected or not detected would come from the distant past.

Nevertheless, projects such as SETI are conducting an astronomical search for radio activity which would confirm the presence of intelligent life.

A related suggestion is that aliens might broadcast pulsed and continuous laser signals in the optical, as well as infrared, spectrum; laser signals have the advantage of not "smearing" in the interstellar medium, and may prove more conducive to communication between the stars.

While other communication techniques, including laser transmission and interstellar spaceflight, have been discussed seriously and may well be feasible, the measure of effectiveness is the amount of information communicated per unit cost, resulting with radio as the method of choice.

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