NASA Detects Anomalous Signals from Comet 3I/ATLAS

NASA’s Asteroid Terrestrial-impact Last Alert System recently detected the interstellar comet 3I/ATLAS in Chile on July 1, 2025. This comet, traveling at a remarkable 58 kilometers per second, has quickly captivated the scientific community and the public alike, raising questions about its origins and properties. As the third confirmed interstellar object, following ‘Oumuamua in 2017 and 2I/Borisov in 2019, 3I/ATLAS presents a unique opportunity to explore the mysteries of our universe.

As 3I/ATLAS nears the end of its journey through the solar system, reports have emerged of unusual radio emissions detected by NASA’s Deep Space Network and the Europa Clipper spacecraft. These findings have prompted planetary defense protocols to monitor the emissions closely. Research led by Associate Professor Michele Bannister from the University of Canterbury indicates that this comet could be between 8 billion and 14 billion years old. If it is closer to the latter figure, the comet was already ancient when our Sun was merely a cloud of gas and dust.

The chemical composition of 3I/ATLAS further highlights its extraordinary nature. As it approaches the Sun, spectrometers have recorded significant emissions of atomic nickel and iron, elements typically scarce in the comas of comets within our solar system. Data from the James Webb Space Telescope also revealed a substantial amount of carbon dioxide, suggesting the comet formed in a much colder region than the Kuiper Belt. Some scientists believe 3I/ATLAS originated in the Milky Way’s “thick disk,” which contains some of the universe’s oldest stars.

Concerns have arisen about the object’s water emission rate, estimated at around 40 kilograms per second. Some researchers argue that this rate is “impossible” for a natural body so far from the Sun’s heat. The unique characteristics of 3I/ATLAS have reignited discussions regarding the possibility of extraterrestrial technology. Avi Loeb, an astrophysicist from Harvard University, has been vocal in advocating for further investigation into the comet’s anomalies, particularly its unexplained “sunward-facing anti-tail,” a jet of gas and dust that appears to point toward the Sun.

Loeb has suggested that there is a 40% probability that such objects could be artificial in origin. He cites the CIA’s “neither deny nor confirm” response to Freedom of Information Act requests related to the comet as an unprecedented level of secrecy surrounding an astronomical body. In response to these claims, the Breakthrough Listen project utilized the Green Bank Telescope and the MeerKAT array to search for technosignatures within a frequency range of 1 to 12 GHz. Although the project detected nearly 471,000 candidate signals during 3I/ATLAS’s Earth flyby on December 18, 2025, researchers concluded these signals were likely the result of local radio interference. Lead researcher Benjamin Jacobson-Bell expressed disappointment, stating, “We all would have been thrilled to find technosignatures coming from 3I/ATLAS, but they’re just not there.”

As 3I/ATLAS continues its trajectory and prepares to pass within 0.36 astronomical units (approximately 33 million miles) of Jupiter on March 16, 2026, scientists look forward to a high-resolution observation of this enigmatic visitor. This encounter offers a final chance to examine the comet closely before it is ejected back into the interstellar void.

For now, 3I/ATLAS stands as a compelling reminder that even as we chart the cosmos, the boundaries between our knowledge and the unknown remain fluid and mysterious.