Planetary nebulae (PNe) are believed to form when the envelope of gas and dust, ejected at the end of the AGB phase of stellar evolution, is heated by the hot stellar nucleus, left after mass loss due to the "superwind" is terminated. The presence of residual molecular gas in PNe ...
Planetary Nebulae are shells of gas surrounding a small, hot star called a white dwarf, which ionizes the gas and gives it a circular appearance resembling a planetary disk. These nebulae are formed when medium-sized stars shed their atmospheres in episodes of strong stellar winds toward the en...
Planetary nebulae are created when a star dies. They are formed by the outer layers of the dying star being ejected into space, which then form an expanding gas shell around the central starAnswer and Explanation: The color of a planetary nebula is determined by the type of star that it ...
Planetary nebulae form after most stars, including stars like our own sun,swell into red giantsas they exhaust hydrogen fuel. At the end of the red giant phase, the star then expels large amounts of its outer material as it gradually — over the course of a million years — transforms i...
ISM: Planetary Nebulae: GeneralRadio Lines: ISMStandard stellar evolution theory is inconsistent with the observed isotopic carbon ratio, 12C/13C, in evolved stars. This theory is also inconsistent with the 3He/H abundance ratios observed in Galactic HII regions, when combined with chemical ...
When stars run out of fuel, planetary nebulas develop. Outer layers of gas form a ring- or bubble-shaped nebula in space.Answer and Explanation: By studying the nebula's chemistry, one may learn more about the star such as how heavy metals and nucleosynthesis rich material from planetary.....
planetary nebulae: individual: NGC 6790radiative transferscatteringstars: mass lossWe present the high-resolution spectra of the young and compact planetary nebula NGC 6790 obtained with the Echelle Spectrograph at Bohyunsan Optical Astronomy Observatory and report the discovery of Raman-scattered He II ...
to influence whether the Sun spends its last millennia at the heart of a spiral, a butterfly, or any of the other entrancing shapes we see in planetary nebulae today,” Decin notes. “Our calculations now indicate that a weak spiral will form in the stellar wind...
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Who discovered planetary nebulae? Who built the first Gregorian telescope? Who came up with celestial coordinates? Who discovered comet Hale-Bopp? What is the solar system mostly made of? What are planetary systems made of? What does heliocentric cosmology mean?