There are about 300 billion stars in the Milkyway galaxy. And it is estimated that on an average each star has 1.6 habitable planets in the orbits around it. This means the number of habitable planets in our galaxy is enormous. Our galaxy could be swirling with life, but we have no proof of it yet.
In May, 2015, a group of astronomers, using a telescope in Russia, RATAN-600, detected an intriguing radio signal that had originated from the HD 164595. The HD 164595 is much like our sun and belongs to the constellation, Hercules. A major difference is that it is 94 light years from the Earth (this means when this star emits light, it travels for 94 years, before it can be seen from Earth).
This was first reported by the website, Centauri Dreams last a few days ago. No study on this has been published so far, but a discussion could be initiated next month, at the 67th International Astronautically Congress (IAC) in Mexico, centered on the plausible reasons for the same.
Nobody really knows the true nature of the signals yet. The possibility of Alien hunters is far from being true.
What made researchers mistake these signals for alien signals is the transmission strength.
The signal’s strength suggested that if it came from outer space, it could be generated only by civilizations that are either Type I or Type II on the Kardashev scale, because the required power to make such a transmission is 1020 watts, or 100 billion watts. That’s hundreds of times more energy than all the sunlight falling on Earth. Only a very futuristic highly evolved civilization could do that. We are Type 0 on the Kardashev scale.
Among the more plausible reasons, the most believable one suggests it could simply be an earth based signal, bouncing off space debris.
One year later, in August 2016, SETI (Search For Extraterrestrial Intelligence) has used their Allen Telescope Array in North California in an attempt to extract the nature of the signal. Seth Shostak, senior astronomer with SETI, told Space.com that it was a false alarm. The institute had pointed the Telescope at HD 164595 on Aug 28 and Aug 29, and found nothing.
Shostak also said that his colleagues will continue to investigate outer space for promising signals.
Till then, we can stick to the image of aliens from the movies.