nebula
/ˈnɛbjʊlə/
A term originating from the Latin word for "mist" or "cloud." In a scientific context, it evokes the image of vast, glowing expanses of interstellar dust and gas, often serving as the birthplaces of stars. Beyond astronomy, it carries a poetic connotation of ambiguity, vagueness, or formlessness. When used metaphorically, it describes something that is hazy, ill-defined, or lacking a concrete structure, similar to "cloudy" but with a more ethereal or cosmic scale. Usage is typically formal or academic in scientific papers, while appearing evocative and atmospheric in literary contexts.
Countable when referring to individual distinct clouds of gas in space, such as the Crab Nebula or the Eagle Nebula.
💬Casual Conversation
That new landing page background, the purple nebula? It's really optimized for engagement.
Yeah, glad it landed for you. Pulled an all-nighter on it.
Meanings
Collocations & Compounds
emission nebula
A nebula composed of ionized gas, which glows because of the radiation from nearby hot stars.
The Orion emission nebula is a stunning sight through a telescope.
reflection nebula
A nebula that shines by reflecting the light of a nearby star.
The Pleiades star cluster contains several small reflection nebulae.
dark nebula
A nebula composed of dust and gas that obscures the light from objects behind it.
The Horsehead dark nebula is a famous example of an interstellar cloud.
planetary nebula
A ring-shaped nebula formed by the outer layers of gas shed during the final stages of a star's life.
The Ring planetary nebula is visible in the constellation Lyra.
molecular nebula
A large cloud of cold gas and dust in interstellar space, often a site of star formation.
Protostars are born within dense molecular nebulae.
Etymology
The word 'nebula' comes from Latin, meaning 'mist' or 'cloud'. It was first used in English in the late 17th century to refer to any faint, cloudy patch of light in the sky, including galaxies and star clusters that we now know are distinct from true nebulae. Over time, with advancements in astronomy, the term became more specifically associated with interstellar clouds of gas and dust.