散さん光こう星せい雲うん

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Meanings

1

noun

diffuse nebula

astronomy

Astronomical term for a nebula that appears spread out and lacks a well-defined shape, as opposed to a planetary nebula or supernova remnant.

散scatter, disperse, spend

光ray, light

星star, spot, dot

雲cloud

惑わく星せい状じょう星せい雲うん
Planetary nebula, which has a more defined, often ring-like shape, unlike the irregular appearance of a diffuse nebula.

Compound of 散光 (scattered light) and 星雲 (nebula). The term is a direct calque of the English 'diffuse nebula'.