For 10 points, what color is included in the name of a "runaway" effect that trapped heat on Venus?
This color names a class of tiny, round starburst galaxies with strong UV LymanÂ­alpha lines, and a class of larger galaxies excited by a onceÂ­active quasar. Those classes arose in the crowdsourced Galaxy Zoo in2007. Emission lines of this color in the Cat's Eye Nebula led William Huggins to propose the element "nebulium." Forbidden lines of [O III] ("oh three") in the Orion Nebula and Hanny's Voorwerp ("honey's VOREÂ­werp") are this color, and are used to make PNLFs. The largest movable radio telescope is in [thiscolor] Bank, West Virginia. The galaxy colorÂ–magnitude diagram's (*) "valley" is this color. As the Sun's upper rim grazes the horizon, it may briefly flash this color. Atomic oxygen in the upper ionosphere produces the 557 nm line of this most prominent color in aurorae. Stars cannot be this color because blackbodies peaking in this colorlook white. For 10 points, what color is included in the name of a "runaway" effect that trapped heat on Venus? 
This color names a class of tiny, round starburst galaxies with strong UV LymanÂ­alpha lines, and a class of larger galaxies excited by a onceÂ­active quasar.
green [accept green pea galaxies, green bean galaxies, green valley, or Green Bank]