planetary nebula

English - Turkish

Definition of planetary nebula in English Turkish dictionary: gezegensi bulut
PN: (Askeri) sözde gürültü (pseudonoise)

English - English

Definition of planetary nebula in English English dictionary: A nebulosity surrounding a dying star, consisting of material expelled by the star; 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; A nebula, such as the Ring Nebula, consisting of a hot, blue-white, central star surrounded by an envelope of expanding gas. Any of a class of bright nebulae that may somewhat resemble planets when viewed through a small telescope but are, in fact, expanding shells of luminous gas around dying stars. A planetary nebula is the outer envelope shed by a red giant star not massive enough to become a supernova. Instead, the star's intensely hot core becomes exposed (see white dwarf star) and ionizes the surrounding shell of gas, which is expanding at tens of miles per second; PN
planetary nebulas: plural form of planetary nebula

planetary nebula

Hyphenation

plan·e·ta·ry ne·bu·la

plänıteri nebyılı

/ˈplanəˌterē ˈnebyələ/ /ˈplænəˌtɛriː ˈnɛbjələ/

() Coined by William Herschel because of their apparent resemblance to the planet Uranus.

History

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