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Numerous red emission nebulas and blue reflection nebulas are visible throughout the image.
无数红热喷射星云和蓝色反射星云也在此图中清晰可见.
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Good spectra of the spiral nebulas are difficult to obtain because of their extreme faintness.
旋涡星云因为非常暗,难以得到它们的清晰的光谱.
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