The alien "Wow!" signal that came from outer space and received in August 1977 has puzzled astronomers for decades. An astronomer has found the answer to the mysterious signal, which was originated from the comets.

The signal was first discovered on Aug. 15, 1977, by an astronomer Dr. Jerry Ehman in the Ohio State University Radio Observatory. The signal was received as the hydrogen line, and displayed the notation of "6EQUJ5." The signal was originated from the Sagittarius constellation, lasted only one minute and never detected again.

This baffled Dr. Ehman and scientists around the world for decades. The signal was given the name "Wow!" signal because its sequence of notation was surprising. It opened the possibility of the existence of extraterrestrial intelligent life in the outer space.

After 40 years of the mystery, the astronomer and Chief Scientist at the Center for Planetary Science who study the alien "Wow!" signal, Professor Antonio Paris convinced that he has found the answer of the signal. The alien "Wow!" signal is believed to come from the two comets that passed the earth, 266P/Christensen and P/2008 Y2 (Gibbs), which passed the area during that time. Professor Paris.

Professor Paris, who is also the Adjunct Professor at St. Petersburg College in Florida, wrote the paper regarding his indication on the alien "Wow!" signal in 2016 with his colleague Evan Davies. In his observation, both of the Comets have large hydrogen clouds that surround them. He suggested the source of the signal was from that hydrogen clouds in the comets.

Subsequently, he spent months in detecting the two comets and pointing the telescope to follow the comets. He discovered a similar signal from the comet 266P. He later observed other comets that have a similar type of hydrogen clouds, and he found the same signal like the alien "Wow!" signal.

However his finding on the source of alien "Wow!" signal raise doubt from Ohio State University Radio Observatory, which expressed skepticism about his theory. It is because both comets are too far away to emit such signal, furthermore, the signal only lasted for one minute and never detected again.