Article by Natasha Kumar June 16, 2020 (thetimeshub.in)
• Despite the fact that we persistently listen to heaven through sensitive antennas, we still have not received any signal from an extraterrestrial civilization and none of them have responded to our messages. Adam Grossman from The Dark Sky Company has created a map of our Milky Way galaxy, illustrating the full extent of its huge size. A radio signal issued on one side of the galaxy would take 100 thousand light-years to reach the other side.
• On Grossman’s map (above), the little blue circle with a diameter of 200 light years around the Earth represents the maximum distance that the first radio signals have traveled from Earth over the past 100 years, since the radio was invented. In this radius of 200 light years around the Earth, there are no known habitable exoplanets, with liquid water and oxygen in the atmosphere.
• SETI (Search for Extraterrestrial Intelligence) is constantly listening to radio signals from space. But considering the size of our galaxy, we’d have to listen for signals for tens of thousands of years before humanity had a chance to establish contact with another civilization. Then double this time to receive a reply.
Are we alone in the Universe or at least in our galaxy? Despite the fact that we persistently listen to heaven your most sensitive antennas, we still have not received any signal from an extraterrestrial civilization and none of them respond to our messages. The Fermi paradox has tried to answer this question, but the answer can be simple, if you look at our milky Way galaxy to scale to rate how vast distances in space and realize that we simply do not hear.
Adam Grossman from The Dark Sky Company has created a map of our galaxy, so you can see the full extent of its huge size. And the milky Way is not the biggest galaxy in the Universe. The diameter of the milky Way is about 100-180 thousand light-years, depending on how you measure. That is, the radio signal issued in one side of the galaxy, you will need at least 100 thousand light-years to reach the other side.
Now, it is worth remembering that our civilization is familiar with the radio only about a century. And the little blue circle with a diameter of 200 light years around the Earth, represents the maximum distance that at the moment overcame the first radio signals from Earth. Below us to hear the alien civilization must be in a tiny radius. It should be noted that in the nearest 200 light years not found any habitable exoplanets, or at least with liquid water and oxygen in the atmosphere.
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