A cluster of stars within an intricate cloud of gas and dust.
1The conditions in the outer strata should bear some resemblance to those existing in the gaseous nebula.
2And the nebula in Draco 4373, seems to present an intermediate stage between the purely gaseous nebula and this one.
3After the novae become fairly faint, the bright lines of the gaseous nebula spectrum are seen for the first time.
4So it has come about that the picture of a hot gaseous nebula revolving as a unit body has given place to other pictures.
5In other words, it is not wise to draw too fine a line between a gaseous nebula and one consisting of solid particles with gas.
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