星せい間かん物ぶっ質しつ

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Meanings

1

noun

interstellar matter

Technical term in astronomy referring to gas and dust between stars.

star, spot, dot

間interval, space

物thing, object, matter

質substance, quality, matter

星せい間かんガス
星間ガス specifically refers to the gaseous component of interstellar matter, while 星間物質 includes both gas and dust.
星せい間かん塵じん
星間塵 refers to interstellar dust, the solid particulate component of 星間物質.

Compound of 星間 (interstellar) and 物質 (matter).