According to author ZN Osmanov, a Research Affiliate at the Search for Extraterrestrial Intelligence (SETI) institute, the maximum distance for potential detection of activities on Earth by an extraterrestrial civilisation is 3000 light-years, an estimate calculated on the basis of the laws of physics

According to Wikipedia, Earth’s civilization is only detectable within a distance of 100 light-years

The Search for Extraterrestrial Intelligence (SETI) is a search for hypothetical intelligent extraterrestrial life. The SETI Institute maintains a repository of resources related to the search for extraterrestrial intelligence. 

The science of extraterrestrial life is known as astrobiology. The Drake equation speculates about the existence of sapient life elsewhere in the universe. 

Aliens are watching us and are snooping on major landmarks across the Earth while using their ultra-advanced telescopes sitting thousands of light years away, a new study has claimed. But there is one catch: They are not observing us in real-time. Instead, there could be a delay of at least 3,000 years due to the time that light takes to travel across space. So, most probably, aliens are able to pick out buildings and structures built on Earth during the times of the Romans, Greeks, Indians and Egyptians.

It means that aliens could use huge and advanced telescopes to snoop on our major landmarks of the past. The study aimed to determine our detectability by categorising alien civilisations based on their technological advancements. 

These classifications are based on the capability of the alien societies to harness the energy of their local star. The proposed categories are as follows: Type-I consumes all the energy incident on a planet from its star; Type-II utilises the total energy of the star; and Type-III is an advanced society that consumes the entire galactic energy.

For this purpose, it is natural to focus on the visible light reflected from the corresponding objects. To identify an observed object with an artificial one, the best way is to spatially resolve it. Therefore, optical telescopes will be used.”

We search for extra-terrestrials in space by blasting infrared messages or sending probe satellites, but what if they are also watching us and observing major landmarks across the Earth from thousands of light years away? According to a new study, it is possible.

Aliens are watching us and are snooping on major landmarks across the Earth while using their ultra-advanced telescopes, a new study has claimed. But there is one catch: They are not observing us in real-time. Instead, there could be a delay of at least 3,000 years due to the time that light takes to travel across space.

Why Have Aliens Never Visited Earth?

There have been various claims on the internet regarding the existence of aliens. Are aliens real? We don’t know for sure, but we want to believe. Outer space is a vast expanse that we have so much more to learn about, which is why it’s hard to flat-out deny the possibility that other intelligent life forms exist.
If life can exist—and persist—in seclusion, and in some of the harshest conditions on Earth, it’s likely that other interplanetary life forms have evolved and acclimated to conditions in space, too

We have shown that Type-I, II, III advanced alien societies might use quantum computers based on artificial black holes, which are able to record the mentioned signals.”

Proposed alien classifications based on energy consumption: Type-I, Type-II, Type-III

These classifications are based on the ability of alien societies to capture energy from their local star. The proposed categories are shown below: Type-I consumes all of the energy incident on a planet from its star; Type-II uses the overall energy of the star; and Type-III is an advanced culture that eats all galactic energy.

The paper reads: “In particular, the question is: might the products of our modern society be seen and potentially detected by the telescopes of ETs?

The study reads: “In particular, the question is: can the artifacts of our technological society be visible and potentially detectable by the telescopes of ETs?

“Since the question is to identify our society with civilization, the major focus should be on the search for large ships, buildings space satellites, etc. Such artifacts might easily be identified as artificial constructions.

“For this purpose, it is natural to focus on the visible light reflected from the corresponding objects. To identify an observed object with an artificial one, the best way is to spatially resolve it. Therefore, optical telescopes will be used.”

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