{"id":3753,"date":"2026-04-07T02:22:04","date_gmt":"2026-04-07T02:22:04","guid":{"rendered":"https:\/\/terrarara.com.br\/en\/?page_id=3753"},"modified":"2026-04-07T02:22:04","modified_gmt":"2026-04-07T02:22:04","slug":"mensagens-alienigenas-podem-ter-chegado-a-terra-por-que-ainda-nao-as-detectamos","status":"publish","type":"page","link":"https:\/\/terrarara.com.br\/en\/?page_id=3753","title":{"rendered":"Alien messages may have reached earth ? why haven’t we detected them yet?"},"content":{"rendered":"
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Alien Messages May Have Reached Earth – Why Haven”t Scientists Found Them”<\/figcaption><\/figure><\/div>
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\r\n\tdoi.org\/10.3847\/1538-3881\/ae394b<\/a>
Credibility<\/a>: 9<\/font>8<\/font>9<\/font>
#Technosignatures<\/a><\/p>

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\r\n\tFor decades, scientists have been scouring the sky for signs of extraterrestrial technology, using radio waves, light flashes, and infrared emissions<\/strong><\/p>

Despite all this effort, no confirmed signal has been found.<\/p>

\r\nA new study from EPFL in Switzerland proposes an intriguing explanation: it is possible that messages from alien civilizations have already passed by Earth without us noticing.\r\n<\/p>

\r\nThe problem isn’t necessarily that the signals don’t exist or haven’t reached us.<\/p>

\r\nWhat may be happening is that they have simply escaped our detection capabilities.<\/p>

\r\nA “technosignal”-any observable evidence of advanced technology, such as artificial radio transmissions, laser pulses, or excessive heat from giant structures-needs to meet two conditions to be discovered: first, it has to reach Earth; second, our instruments need to be able to identify it.\r\n<\/p>

\r\nOften, even when a signal arrives, it can be too weak, last only a few moments, be on a frequency we are not monitoring, or get lost in the background noise of space.<\/p>

\r\nThis means that, over the last 60 years of SETI searches (the search for extraterrestrial intelligence), it is quite plausible that several signals have crossed our region of space unnoticed.\r\n<\/p>

\r\nTheoretical physicist Claudio Grimaldi, from EPFL, analyzed this possibility using statistical models.<\/p>

\r\nHe calculated how many signals would need to have passed by Earth since 1960 for us to have a reasonable chance of detecting one now, and where these signals would likely come from.<\/p>

\r\nThe study considers both signals that spread in all directions (like the waste heat from megastructures) and more directional beams, such as lasers or interstellar beacons.\r\n<\/p>

\r\nThe results are revealing and somewhat discouraging for those who expected a quick discovery.<\/p>

\r\nTo have a good probability of detecting a technosignal coming from relatively close distances-a few hundred or a few thousand light-years-an extremely high number of signals would have to have already passed us by unnoticed.<\/p>

\r\nIn many simulated scenarios, this number is unrealistic, greater than the number of habitable planets that would exist in that region of the Milky Way.\r\n<\/p>

\r\nDetection becomes more realistic only when we broaden our perspective to much greater distances.<\/p>

\r\nIf the signals last a long time and are spread throughout the galaxy, then messages coming from several thousand light-years away could be picked up by us.<\/p>

\r\nEven so, the expected number of detectable signals at any given time remains very small.\r\n<\/p>

\r\nThis view changes the search strategy.<\/p>

\r\nInstead of waiting for strong, nearby signals, the future of SETI will likely depend on continuous, large-scale, long-term observations covering vast regions of the Milky Way.<\/p>

\r\nThe absence of detections so far does not mean that there is nothing out there-it may simply indicate that the signals are rare, distant, or long-lasting.<\/p>

\r\nIn short, alien messages may actually have reached Earth.<\/p>

\r\nThe challenge lies in honing our listening skills and having the patience to search further and for longer.<\/p>

\r\nThe discovery, if it happens, may require a more persistent and comprehensive approach than we imagined.\r\n<\/p>

\r\n

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Alien messages may have reached earth – why haven't we detected them yet?#Technosignatures<\/a>

For decades, scientists have been scouring the sky for signs of extraterrestrial technology, using radio waves, light flashes, and infrared emissions.

Video: pic.twitter.com\/odO0GpvX8h<\/a><\/p>— Rare Earth (@rareearth0) April 7, 2026<\/a><\/blockquote>