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A nebula is a cloud of dust and gas. I'm not sure exactly what you mean by "unstable" in this context, since I don't know what you consider "stable". Nebulae are dynamic, changing in response to gravitational forces and radiation pressure; the only way I can think of for one to be "stable" would be if the gravitational forces exactly balanced out the radiation pressure, which would just by the nature of things have to be metastable at best.

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