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OCR: FACT FILE THE GREENHOUSE EFFECT makes the average surface temperatures on Mars, Earth, and Venus about 5 º, 35 º, and 500 ℃ (41 ", 95 ", and 932 "F) warmer, respectively, than they would be if their atmospheres were completely transparent to thermal infrared radiation (heat). The atmospheres of Mars and Earth are transparent to certain wavelengths of infrared, but the Venusian atmosphere is completely opaque.