New Delhi, June 3: The European Space Agency (ESA) has announced a significant scientific discovery. The James Webb Space Telescope has recorded the detailed chemical fingerprint of an interstellar object for the first time. This object, known as Comet 3I-ATLAS, is now exiting our solar system after orbiting the Sun.
The study focused on the comet as it was leaving the solar system. The Webb Telescope conducted a thorough analysis of the gases surrounding the comet during its close approach to the Sun. The findings reveal that this comet is markedly different from typical comets found within our solar system.
According to the Webb Telescope, water vapor was widely dispersed in the comet’s coma (the gaseous envelope). This vapor originated from icy particles located far from the nucleus. In contrast, carbon dioxide and methane were primarily found near the core. Notably, the presence of methane has been recorded for the first time in an interstellar comet.
Scientists were particularly surprised to find that the amount of methane was significantly higher than that of water. This level is rarely observed in solar system comets. Additionally, the ratio of carbon dioxide to water was unusually high.
Experts suggest that these indicators imply that Comet 3I-ATLAS formed in a very different environment, possibly around another star where the temperature and chemical conditions were entirely distinct.
The Webb Telescope observed this comet on two occasions. The first observation occurred in mid-December 2025 when it was approximately 330 million kilometers from the Sun. The second observation took place on December 27, 2025, when it had moved even farther away, reaching a distance of 380 million kilometers. Data collected from both instances has provided scientists with a clearer understanding of the comet’s origin and structure.
ESA noted that we may never see this comet again, as it has now ventured far beyond our solar system. However, this discovery offers valuable insights. It will aid future studies of other interstellar objects and enhance our understanding of how chemicals form in different parts of the universe.
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