# JWST Finds Forbidden Trihydrogen Signal in Space

> JWST spots elusive trihydrogen light from a newborn star's shockwave.
- Title: JWST Finds Forbidden Trihydrogen Signal in Space | Shortify
- Summary: JWST spots elusive trihydrogen light from a newborn star's shockwave. JWST detected H₃⁺'s forbidden rotational signal in Herbig-Haro 168, revealing cosmic…
- Keywords: jwst, trihydrogen cation, herbig-haro 168, cosmic chemistry, star formation, rotational transitions, spectral lines, shock waves, ScienceAlert
- Source: ScienceAlert — https://sciencealert.com/jwst-detects-a-forbidden-signal-never-before-seen-in-the-universe-not-even-in-a-lab
- Author: Michelle Starr
- Published: 2026-11-12T12:00:00+00:00
- Read time: 1 min
- Topics: jwst, trihydrogen cation, herbig-haro 168, cosmic chemistry, star formation, rotational transitions, spectral lines, shock waves, science
## The Forbidden Signal
Astronomers detected H₃⁺'s elusive rotational light for the first time in the universe.

> It's the foundation for almost all gas-phase interstellar chemistry
## Why H₃⁺ Matters
H₃⁺ is the molecule that made the universe and forms complex organic molecules for life.
## The 1986 Prediction
Astrophysicists Fu-Shih Pan and Takeshi Oka calculated H₃⁺ should emit faint rotational light in 1986.
## The JWST Discovery
JWST detected 26 faint spectral lines from H₃⁺ in Herbig-Haro 168, with 72 sigma confidence.
## The Shockwave Connection
The signal tracked hot molecular hydrogen, showing both molecules respond to newborn star shockwaves.
## The Mystery Deepens
Shock wave models underestimated H₃⁺ emission by five to six times or used unvalidated conditions.
## The Second Signal
JWST also found H₃⁺ emission in Herbig-Haro 211, confirming the signal's cosmic presence.
## What This Means
H₃⁺ could help scientists understand star formation shockwaves and cosmic chemistry.
## Key takeaway

JWST detected H₃⁺'s forbidden rotational signal in Herbig-Haro 168, revealing cosmic chemistry in newborn stars.