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On Jan. 7th, 2026, the Subaru Telescope joined many of the world's observatories and space telescopes in observing the 3I/ATLAS, the third interstellar object (ISO) detected in our Solar System. This interstellar comet had just completed its closest approach to the Sun, which produced more intense outgassing. By observing the light from 3I/ATLAS' coma, astronomers were able to examine the chemical composition of the comet's interior and produce estimates of the ratio of carbon dioxide to water.

