A new study claims that aliens could be listening in on us from light-years away, with the right technology.
Scientists say humans have been transmitting signals into space for nearly a century, unintentionally.
A new study suggests that aliens with advanced technology could be able to detect humans through these accidental transmissions.
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It is through radio, television, mobiles, and radars, that these high-frequency signals can reach space.
A study from experts at the University of Manchester used crowd-sourced data to stimulate radio leakage from mobile towers.
Researchers hope to determine what alien civilizations might be able to detect.
To conduct this study, models were generated by Ramiro Saide, an intern at the Search for Extraterrestrial Intelligence (SETI) Institution's Hat Creek Radio Observatory in the US, as reported by Sky News.
The results also showed the Earth's mobile radio signature includes a substantial contribution from developing countries such as Africa.
The team said this is exciting because it highlights the countries' success in moving directly into the digital age.
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Professor Mike Garrett, team leader of the project at the University of Manchester, said: "I've heard many colleagues suggest that the Earth has become increasingly radio-quiet in recent years – a claim that I always contested.
"Although it's true we have fewer powerful TV and radio transmitters today, the proliferation of mobile communication systems around the world is profound."
Professor Garrett said while each system represents low radio powers, the "spectrum of billions of these devices is substantial."
He added: "Current estimates suggest we will have more than 100,000 satellites in low Earth orbit and beyond before the end of the decade.
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"The Earth is already anomalously bright in the radio part of the spectrum; if the trend continues, we could become readily detectable by any advanced civilisation with the right technology."
Dr Nalini Heeralall-Issur, associate professor at the University of Mauritius, said: "I believe that there's every chance advanced civilisations are out there and some may be capable of observing the human-made radio leakage coming from planet Earth."
Researchers are soon to look through their findings and plan to investigate other sources of Earth’s radio leakage.
This includes military radars, new digital broadcast systems, wi-fi networks, individual mobile handsets and satellite constellations.
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