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Diffuse Nebulae (547 words)
	Diffuse nebulae, sometimes inacurately referred to as gaseous nebulae, are clouds of interstellar matter, namely thin but widespread agglomerations of gas and dust.
	The first diffuse nebula discovered was the Orion Nebula, M42, observed telescopically in 1610 by N.
	Diffuse nebulae were longly be considered as distant, unresolved star clusters or star clouds, until in the 1860s spectroscopy revealed their gaseous nature by showing line spectra, in particular due to the pioneering research of William Huggins.

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