How To Use Planetary nebula In A Sentence
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The reason why most planetary nebulae are not spherical is not well understood.
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I know that a planetary nebula is different than a hydrogen cloud.
About: The Progressive Diminishment of Man
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NGC 2818 is a beautiful planetary nebula, the gaseous shroud of a dying sun - like star.
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The "puffing" from the AGB star converting into the PNN Planetary Nebula Nucleus is not like a switch that is instantly turned off, but is likely an intermittent affair.
Red Giant Brightness Variations Still Mysterious | Universe Today
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The average radial velocity of 47 planetary nebulae is about 45 km. per second; and, if the motions of the planetaries are somewhat at random, their average velocities in space are twice as great, or 90 km. per second.
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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The nebula is clearly a planetary nebula, and the gas seen above composed the outer layers of a sun-like star only 10,000 years ago.
SETI Institute: Life at the SETI Institute: Paul Estrada -- From Dust to Planets
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In keeping with astronomical tradition, the new planetary nebula will probably be named after its lead discoverer.
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Sure enough, there was a huge shell of clumpy, hole-riddled gas that looked like a nearly dissipated planetary nebula.
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"Planetary nebulae are shells of gas ejected by dying stars, " Kastner explains.
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We note that even if magnetohydrodynamic forces are not the main driving mechanism for the Source I wind, magnetic forces may still play a key role in shaping the outflow, similar to what has been proposed for planetary nebulae e.g., Blackman 2008 and references therein.
New Movie Reveals Birth of Super-Suns | Universe Today
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Then, for a relative blink of about 1, 000 years or less, the star becomes a planetary nebula.
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A planetary nebula forms when Sun-like stars gently eject their outer gaseous layers to form bright nebulae with amazing twisted shapes.
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It was discovered by William Herschel on February 15, 1786, and was the first planetary nebula whose spectrum was investigated, by the English amateur astronomer William Huggins in 1864.
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Until recently, it was thought that shells around planetary nebulae were a rare phenomenon.
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This particular planetary nebula, pictured above and designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure.
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Planetary nebulae fade away gradually over tens of thousands of years.
