| planetary nebula | (n) a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star |
| 惑星状星雲 | [わくせいじょうせいうん, wakuseijouseiun] (n) planetary nebula [Add to Longdo] |