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I start with an $\mathrm{N}$ and end with an $\mathrm{A}$, a celestial beauty, far away. A stellar nursery, where stars are born, in the night sky, I adorn. I'm a cloud of dust and gas, through a telescope, don't let me pass. From the Eagle to the Horsehead, I wear many masks, capturing the universe's tasks. Who am I, this celestial drape, painting the cosmos, in vibrant shape?