Fu-Shih Pan

Physicist, University of Chicago (1986 study)

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Last updated Nov 13, 2026

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JWST detects a forbidden trihydrogen signal predicted in 1986

New Capabilities

Co-author of the original prediction

Astronomers calculated in 1986 that the trihydrogen cation would emit a faint rotational glow. For four decades no telescope or laboratory saw it. Then JWST found 26 of those spectral lines in the shocked gas around a newborn star.

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