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...nded by a pinwheel-shaped nebula, '''IRAS 23166+1655''', thought to be a [[Protoplanetary nebula|preplanetary nebula]]. It is a [[binary system (astronomy)|binary s ...Pinwheel Outflow from the Extreme Carbon Star, AFGL 3068|journal=Planetary Nebulae in Our Galaxy and Beyond|volume=234|pages=469|last1=Morris|first1=Mark|last ...

...stL...19..169A|title=The variability of four yellow supergiants - Possible protoplanetary objects|journal=Astronomy Letters|volume=19|pages=169|last1=Arkhipova|first ...0 = L. B. F. M. | s2cid = 6602462 }}</ref> others think it is actually a [[protoplanetary nebula]] or a smaller post-[[Asymptotic giant branch|AGB]] star at a distan ...

...tar, in transition from the [[Asymptotic giant branch|AGB]] phase to the [[protoplanetary nebula]] phase.<ref name="Kim"/> It is surrounded by a thick [[circumstella ...has developed the bipolar shape that is frequently seen in protoplanetary nebulae.<ref name="Schmidt"/> High spatial resolution [[Interferometry|interferome ...

{{main|Protoplanetary disk}} ...unt of [[angular momentum]], which results in the formation of a gaseous [[protoplanetary disc]] around the young, rotating star. The former is a rotating circumstel ...

...date=2004|title=ISO spectroscopy of gas and dust: From molecular clouds to protoplanetary disks|journal=Annual Review of Astronomy and Astrophysics|volume=42|pages=1 ...atmosphere on [[Titan (moon)|Titan]] and the gas clouds that are within [[nebulae]] and the confines of dying stars.<ref>{{cite journal|last1=Chen|first1=W.| ...

...ns. I – UBV photometry and MK spectroscopy of stars in southern reflection nebulae ...gested by Sidney van den Bergh after he discovered that the stars in these nebulae had a non-uniform distribution.<ref name="ra1" /> These young stellar group ...

...galaxy#Spiral arms|spiral arms]] and around the [[Galactic Center]]. Dark nebulae are dark because naked interstellar dust or dust covered with condensed gas ...e Millimeter/submillimeter Array|ALMA]] image of the [[Protoplanetary disk|protoplanetary disc]] around [[HL Tauri]] ]] ...

...year|Myr]], which could be caused by delayed [[planet formation]] in the [[Protoplanetary disk|disk]].<ref name="Zhou2022" /> Other system ages include 1 - 5 [[Megay | A rogue planet/[[sub-brown dwarf]] that is surrounded by a [[protoplanetary disk]], the first one to be confirmed. It is one of youngest free-floating ...

...Kuiper belt to explain the formation of the disk, and asks "why would the protoplanetary disk end near 30&nbsp;AU and restart beyond 100&nbsp;AU?"<ref name=Dvorsky_ ...tion of the sky are heavily contaminated by the emission from the galactic nebulae, making detection of Planet Nine thermal emission problematic close to the ...