planetary nebula

listen to the pronunciation of planetary nebula
English - Turkish
gezegensi bulut
PN
(Askeri) sözde gürültü (pseudonoise)
English - English
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

    Turkish pronunciation

    plänıteri nebyılı

    Synonyms

    pn

    Pronunciation

    /ˈplanəˌterē ˈnebyələ/ /ˈplænəˌtɛriː ˈnɛbjələ/

    Etymology

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