noun
gaseous nebula
Technical term in astronomy for a nebula composed primarily of gas, as opposed to dust or plasma.
オリオン大星雲は代表的なガス状星雲の一つです。
The Orion Nebula is one of the most famous gaseous nebulae.
Compound of ガス状 (gas-like) and 星雲 (nebula). The exact historical derivation is uncertain; the term is a modern scientific coinage.