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Can ET Detect Us?

Can ET Detect Us?

Ramiro Saide
Ramiro Saide at the Allen Telescope Array in Hat Creek, California. Image Credit: Ramiro Saide.

May 2, 2023, Mountain View, CA, Manchester, UK and Mauritius -- What would the Earth look like to an alien civilization located light years away? A team of researchers from Mauritius and Manchester University has used crowd-sourced data to simulate radio leakage from mobile towers and predict what an alien civilization might detect from various nearby stars, including Barnard's star, six light years away from Earth. Ramiro Saide, currently an intern at the SETI Institute's Hat Creek Radio Observatory and  M.Phils. student at the University of Mauritius, generated models displaying the radio power that these civilizations would receive as the Earth rotates and the towers rise and set. Saide believes that unless an alien civilization is much more advanced than ours, they would have difficulty detecting the current levels of mobile tower radio leakage from Earth. However, the team suggests that some technical civilizations are likely to have much more sensitive receiving systems than we do, and the detectability of our mobile systems will increase substantially as we move to much more powerful broadband systems.

Saide is also excited by the fact that his simulations show that the Earth’s mobile radio signature includes a substantial contribution from developing countries, including Africa. According to team leader Professor Mike Garrett (University of Manchester, Jodrell Bank Centre for Astrophysics), “the results highlight Africa’s success in bypassing the landline stage of development and moving directly into the digital age.” Garrett is pleased with the results. “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. While each system represents relatively low radio powers individually, the integrated spectrum of billions of these devices is substantial.”

Dr. Nalini Heeralall-Issur, Saide’s supervisor in Mauritius, thinks Saide might be right. “Every day we learn more about the characteristics of exoplanets via space missions like Kepler and TESS, with further insights from the JWST – I believe that there’s every chance advanced civilizations are out there, and some may be capable of observing the human-made radio leakage coming from planet Earth.”

The team is eager to extend their research to include other contributors to the Earth’s radio leakage signature. The next step is to include powerful civilian and military radars, new digital broadcast systems, Wi-Fi networks, individual mobile handsets and the swarm of satellite constellations now being launched into low Earth orbit, such as Elon Musk’s Starlink system. According to Garrett, “Current estimates suggest we will have more than one hundred thousand satellites in low Earth orbit and beyond before the end of the decade. 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 civilization with the right technology.”

Figure 1
Figure 1: Presents the distribution of mobile towers across the Earth and the intensity of the radio power they transmit into space. View larger image.
Figure 2
Figure 2: The modulation of the radio leakage generated by mobile communication towers on the Earth as it rotates on its axis, as might be measured by an observer located at Barnard’s star. Note the contribution made by the continent of Africa and other developing regions. View larger image.

"This work is a superb example of how a detailed analysis of the properties of human technology (the “anthropogenic technosphere”) can be leveraged toward developing exciting, novel strategies for detecting extraterrestrial technologies,” said Allen Telescope Array Project Scientist Dr. Wael Farah.  "We look forward to using the unique instrumentation capabilities and scheduling flexibility of the Allen Telescope Array, paired with our growing knowledge of nearby exoplanet systems, to undertake new searches based on these strategies.”

The paper has been accepted by MNRAS:

The paper is also available on the arXiv:

Saide’s M.Phil research has been funded by the Development in Africa with Radio Astronomy (DARA) Project:

About the SETI Institute
Founded in 1984, the SETI Institute is a non-profit, multi-disciplinary research and education organization whose mission is to lead humanity’s quest to understand the origins and prevalence of life and intelligence in the Universe and to share that knowledge with the world. Its research encompasses the physical and biological sciences and leverages expertise in data analytics, machine learning and advanced signal detection technologies. The SETI Institute is a distinguished research partner for industry, academia and government agencies, including NASA and NSF.

Contact information
Rebecca McDonald
Director of Communications
SETI Institute

About the University of Mauritius
The University of Mauritius is a research-engaged and entrepreneurial University. Its mission is to develop world-class education, impactful and innovative research through an entrepreneurial culture while promoting engagement with the civil society.

About the University of Manchester
The University of Manchester is part of the prestigious Russell Group of universities, and is a centre of teaching excellence and innovative research. Jodrell Bank Centre for Astrophysics (JBCA) is a major research centre for astronomy & astrophysics in Europe, and is part of the Dept. of Physics & Astronomy. JBCA also operates e-MERLIN and the 76-m Lovell Telescope.  

Professor Michael Garrett, Sir Bernard Lovell Chair of Astrophysics, and Director of Jodrell Bank Centre for Astrophysics (JBCA), University of Manchester.

Dr Nalini Heeralall-Issur,  Associate Professor, Department of Physics, Head, MRT Radio Observatory and DARA Coordinator, University of Mauritius.

Mr. Ramiro Saide,  (from Mozambique) is an MPhil Student at the University of Mauritius and now an Intern at the SETI Institute.




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