NASA Confirms Water On Interstellar Comet 3I/ATLAS, Scientists Say It Could Hold Clues to Alien Life

Water on Interstellar Comet 3I/ATLAS: In one of the most exciting astronomical discoveries of the decade, NASA’s Neil Gehrels Swift Observatory confirmed traces of water on interstellar comet 3I/ATLAS, marking a groundbreaking moment for planetary science. The weak ultraviolet signal caused by hydroxyl gas, a byproduct of the breakdown of water molecules under sunlight, was detected as the comet passed through our Solar System.

“Every interstellar comet so far has been a surprise,” according to principal investigator Dr Zexi Xing from Auburn University, and 3I/ATLAS is no exception.

A visitor older than the world itself

First discovered by Hawaii’s ATLAS telescope in July 2025, 3I/ATLAS is the third interstellar object known to pass through our Solar System, following ‘Oumuamua in 2017 and Borisov in 2019. What makes this comet remarkable is its ancient origin: astronomers estimate that it is about seven billion years old, almost twice the age of the Earth.

Traveling at over 58 km/s on a hyperbolic path, 3I/ATLAS entered another star system and will eventually leave our Solar System for good, offering scientists a rare glimpse into the chemistry of distant worlds.

Discovery in Water: Clues on the Origin of Life

Ultraviolet radiation detected by NASA’s observatory provided the first chemical evidence of water activity on an interstellar comet at such a great distance from the Sun. Even more interesting, the comet was losing approximately 40 kilograms of water per second, even though it was too far from the Sun for the ice to evaporate.

The co-author of the research is Prof. “This shows that the icy grains of 3I/ATLAS are reacting in ways we have never seen before,” said Dennis Bodewits. “We’re rewriting what we know about comet behavior.”

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Why Is This Discovery Important?

The discovery of water in 3I/ATLAS strengthens the intriguing possibility that the components of life are not unique to our Solar System. Just as ‘Oumuamua appears dry and Borisov is rich in carbon monoxide, 3I/ATLAS now reveals its watery composition, indicating that water-rich comets may be scattered throughout the galaxy.

“When we detect water from an interstellar comet, we are actually reading a message from another planetary system. This tells us that the chemistry of the origins of life may be universal,” Bodewits said.

What’s Next for 3I/ATLAS?

Although the comet has temporarily disappeared from view, astronomers expect it to become visible again in mid-November 2025, providing another chance to observe its activities up close. With advanced instruments and continued international collaborations, scientists hope to uncover more secrets about how ancient star systems evolved and whether they might once have hosted life.

For now, NASA’s discovery serves as a cosmic reminder that water, carbon, and complex molecules—the building blocks of life—may be much more common in the universe than we imagine.

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(This article is for general information purposes only. Zee News does not guarantee its accuracy or reliability.)