In the distant future intergalactic lighthouses are also considered.
We do not have to wait to draw attention to potential alien civilization. At least not long.
A new study has revealed that we will soon be able to send the air to the visible cosmos from the distance of 20,000 light years. Existing laser technology and space telescopes will be enough to complete us over the next ten years.
Research work published by The Astrophysical Journal.
Can humanity make extraterrestrials aware of the available technology? This question was raised by James Clark and Kerri Cahoy from Massachusetts Technical University (MIT) in a new study.
A few scientists came out of a simple concept – a combination of infrared laser and cosmic telescope. The bi-direction would concentrate (focus) on the laser beams and transmit them to the outer universe in the form of a cosmic lighthouse.
But the signal should be strong enough that the potential cosmic observer differs from the infrared sunlight.
Clark and Cahoy explored the cosmic signal intensity that would create combinations of different lasers and cosmic binoculars.
Thousands of light years
Researchers have found that a combination of 2 megawatt lasers and a 30-meter telescope creates a signal that can be easily detected during orbit Proxima Centauri b.
This Earth-like planet is 4 light years from the sun.
A 1 megawatt laser and a 45-meter telescope would generate a change signal to cover the entire living space in the planetary TRAPPIST-1 system.
At about 40 light years from the Sun there are seven planet Earths. Many of them have a lot of water and live in the living room.
They may not be mature
The researchers were surprised to see that any extraterrestrial civilization could capture the human being's signal through a 1-meter telescope in these cosmic lighthouses.
In other words, it should not be anything more advanced than modern mankind.
Using both of the aforementioned combinations of laser telescopes, however, it would be possible to send a sufficiently intense signal to detect potential aliens at distances of up to 20,000 light years.
This corresponds to the distance from Earth to the center of the Milky Way.
Any extraterrestrial astronomer could see at first glance through our cosmic lighthouse that the Sun's spectrum is quite atypical.
"I do not know if he could attack an intelligent life around the Sun as the first option, but he certainly will attract his attention," says James Clark.
A cosmic observer can be thrown out of doubt, for example by sending a short message. According to Clark, it would be enough to modulate the laser radiation at the length of impulses of different lengths. It would be a laser mullet.
Clark and Cahoy discovered that a "cosmic beacon" would be enough for lasers that have been in human technology for nearly twenty years.
For example, 1 to 2 megawatts corresponds to US Air Force Launcher YAL-1, intended for ballistic missiles, which was used between 2002 and 2014.
And although there is currently no 30-meter telescope, 39 meters of ultra-large telescope (ELT) is under construction. The start of work is scheduled for 2024.
Clark and Cahoy in their study recall that some scientists have suggested that huge 10 kilometers and stogigawatt lasers use to accelerate spacecraft.
The construction of these paramaters is in their opinion the music of the far future. But if that happens, they could serve as cosmic lamps that can be detected from a distance of 100 million light years.
This means that humanity would not only discover the possible alien civilization in the Milky Way. But even those who inhabit thousands of galaxies by our local superstars.