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NASA has revealed new details about 3I\/ATLAS<\/strong>, the mysterious interstellar comet racing back toward deep space after making its historic journey through our Solar System, and the latest observations show that this visitor is chemically stranger than most comets astronomers have ever studied. Discovered in 2025, 3I\/ATLAS is only the third confirmed interstellar object<\/strong> detected passing through our planetary system, meaning it formed around another star before being thrown into interstellar space.<\/p>\n While dramatic online images have portrayed the object as a gigantic artificial spacecraft and suggested that NASA is \u201chiding\u201d its true identity, NASA\u2019s observations currently support a natural cometary origin, and the agency says the object poses no threat to Earth. NASA Science<\/a> What scientists have uncovered, however, is remarkable enough without invoking an alien spacecraft. Using the James Webb Space Telescope, researchers obtained detailed chemical measurements of 3I\/ATLAS after its closest approach to the Sun.<\/p>\n Webb detected unusually high proportions of heavy hydrogen and carbon-13 compared with comets from our own Solar System. According to NASA, these chemical fingerprints indicate that 3I\/ATLAS probably formed in an environment dramatically different from the one that produced our Sun and planets and may have been traveling through interstellar space for billions of years. NASA Science<\/a> Even more surprisingly, Webb later made the first direct detection of methane gas around an interstellar visitor<\/strong>.<\/p>\n The methane appeared after 3I\/ATLAS had passed around the Sun, suggesting that some of the volatile material had remained buried beneath its surface until solar heating penetrated deeper layers. Researchers also found that the comet was exceptionally rich in carbon dioxide relative to water\u2014another clue that its birthplace was unlike the region where most familiar comets formed.<\/p>\n NASA Science<\/a> NASA\u2019s SPHEREx observatory added another piece to the puzzle when it detected water, carbon dioxide and organic molecules including methanol, cyanide and methane in the comet\u2019s expanding coma. Scientists stressed that \u201corganic\u201d does not<\/strong> mean biological; such carbon-containing molecules can form naturally without life.<\/p>\n SPHEREx also observed 3I\/ATLAS becoming dramatically brighter after perihelion as solar heat reached material beneath its radiation-processed outer crust, triggering fresh eruptions of ancient ice, gas, dust and rocky material. NASA Science<\/a> Rather than exposing a hidden spacecraft, these observations may be revealing something scientifically more valuable: a preserved chemical sample from an entirely different planetary system.<\/p>\n Every molecule escaping 3I\/ATLAS carries information about the conditions surrounding another star perhaps billions of years ago. Webb\u2019s measurements suggest its isotopic composition is significantly different from Solar System comets, giving astronomers an unprecedented opportunity to compare our planetary neighborhood with another one directly.<\/p>\n<\/p>\n<\/p>\n<\/p>\n