Now, research published in Nature Astronomy and led by an undergraduate student at the University of Toronto, Peter Ma, along with researchers from the SETI Institute, Breakthrough Listen and scientific research institutions around the world, has applied a deep learning technique to a previously studied dataset of nearby stars and uncovered eight previously unidentified signals of interest.
"In total, we had searched through 150 TB of data of 820 nearby stars, on a dataset that had previously been searched through in 2017 by classical techniques but labeled as devoid of interesting signals," said Peter Ma, lead author.
"We're scaling this search effort to 1 million stars today with the MeerKAT telescope and beyond. We believe that work like this will help accelerate the rate we're able to make discoveries in our grand effort to answer the question 'are we alone in the universe?'"
The search for extraterrestrial intelligence (SETI) looks for evidence of extraterrestrial intelligence originating beyond Earth by trying to detect technosignatures, or evidence of technology, that alien civilizations could have developed. The most common technique is to search for radio signals.
Radio is a great way to send information over the incredible distances between the stars; it quickly passes through the dust and gas that permeate space, and it does so at the speed of light (about 20,000 times faster than our best rockets). Many SETI efforts use antennas to eavesdrop on any radio signals aliens might be transmitting.
This study re-examined data taken with the Green Bank Telescope in West Virginia as part of a Breakthrough Listen campaign that initially indicated no targets of interest. The goal was to apply new deep learning techniques to a classical search algorithm to yield faster, more accurate results. After running the new algorithm and manually re-examining the data to confirm the results, newly detected signals had several key characteristics:
+ The signals were narrow band, meaning they had narrow spectral width, on the order of just a few Hz. Signals caused by natural phenomena tend to be broadband.
+ The signals had non-zero drift rates, which means the signals had a slope. Such slopes could indicate a signal's origin had some relative acceleration with our receivers, hence not local to the radio observatory.
+ The signals appeared in ON-source observations and not in OFF-source observations. If a signal originates from a specific celestial source, it appears when we point our telescope toward the target and disappears when we look away. Human radio interference usually occurs in ON and OFF observations due to the source being close by.
Cherry Ng, another of Ma's research advisors and an astronomer at both the SETI Institute and the French National Center for Scientific Research said, "These results dramatically illustrate the power of applying modern machine learning and computer vision methods to data challenges in astronomy, resulting in both new detections and higher performance. Application of these techniques at scale will be transformational for radio technosignature science."
While re-examinations of these new targets of interest have yet to result in re-detections of these signals, this new approach to analyzing data can enable researchers to more effectively understand the data they collect and act quickly to re-examine targets. Ma and his advisor Dr. Cherry Ng are looking forward to deploying extensions of this algorithm on the SETI Institute's COSMIC system.
Since SETI experiments began in 1960 with Frank Drake's Project Ozma at the Greenbank Observatory, a site now home to the telescope used in this latest work, technological advances have enabled researchers to collect more data than ever.
This massive volume of data requires new computational tools to process and analyze that data quickly to identify anomalies that could be evidence of extraterrestrial intelligence. This new machine learning approach is breaking new ground in the quest to answer the question, "are we alone?"
Machine Learning Aids in Search for Extraterrestrial Life
Additional comment was sought from ChatGPT which said, "In recent years, advancements in technology have opened up new avenues for the search of extraterrestrial life. The field of machine learning is playing an increasingly important role in this endeavor.
Machine learning algorithms are capable of analyzing vast amounts of data and finding patterns that would be impossible for a human to detect. Scientists and researchers are now using these algorithms to analyze data from telescopes, satellites, and other instruments used to detect signs of life on other planets.
One of the key benefits of using machine learning in the search for extraterrestrial life is its ability to quickly process large amounts of data. This means that scientists can quickly identify potential candidates for further study, without having to spend months or even years analyzing the data themselves.
Additionally, machine learning algorithms are also able to identify patterns in the data that might not be immediately obvious. This could include identifying unusual signals in the data that could indicate the presence of life, or finding correlations between different data sets that could suggest a connection.
While the use of machine learning is still in its early stages in the search for extraterrestrial life, the potential benefits are significant. As technology continues to advance, the role of machine learning in this field is likely to become even more important.
The use of machine learning algorithms is proving to be a valuable tool in the search for extraterrestrial life. With its ability to process vast amounts of data and identify patterns that would be difficult for humans to detect, it has the potential to revolutionize the way we approach this important scientific pursuit."
This research is published in Nature Astronomy and can be found here.
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