The Green Valley ·
galaxy bimodality
un
seel
.com · blue cloud · red sequence · the sparse bridge
Crossing
~1–2 Gyr
Valley sSFR
10⁻¹¹·⁵–10⁻¹⁰·⁵ yr⁻¹
phase
—
Blue cloud · star-forming
Green valley · in transit
Red sequence · quenched
Star-formation shutdown
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.com · The Green Valley