Gunn-Peterson Trough ·
z ≈ 6
un
seel
.com · neutral H scatters Lyman-α
σ
α
4.5×10⁻¹⁸ cm²
τ
GP
0
operation
—
Quasar UV photons
Neutral hydrogen
Lyman-α resonance
Spectrum / trough
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.com · Gunn-Peterson Trough