A collection of ionized gases and dust in interstellar space
Questions tagged [nebula]
95 questions
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What causes the sharp if irregular boundary line in the "Cosmic Cliffs" JWST Carina image?
In this recently released JWST image:
we can see a relatively sharp, if irregular, boundary line between a region appearing mostly bluish and a region appearing mostly reddish or orange (understood that these are assigned, not natural colors). What…
Anthony X
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Is Barnard 68 the only cloud so close to us that there are no stars between us and it?
Regarding molecular clouds / absorption nebulae / Bok globules / obscuring clouds,
(I'm not sure if there's one generic term encompassing all those and any similar obscuring clouds - I just used "cloud" in the question title),
is Barnard 68 the only…
Fattie
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Are nebulae only visible from a distance?
There's plenty of data about the density of nebulae, and obviously they're pretty thin. This is space, after all, and these things are really, really big.
But I'm wondering about the practical experience of that density. Are the colorful patterns…
Nerrolken
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Whose name is Minkowski 92 bearing?
Minkowski 92 is a protoplanetary nebula. But after which Minkowski is it named? Same question for Minkowski's object (part of NGC 541).
Ark25
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How big is nebula dust?
Whenever I see the term dust for the particles of a nebula, I ask myself whether this is actually based on some reliable measure of particle size. Of course we can all agree it looks like dust from this distance. And we all know how such appearances…
it's a hire car baby
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Whose name is Fleming 1 nebula bearing?
Fleming 1 is an unusual planetary nebula situated in the Centaurus constellation.
Yet it is not clear after who it was named
Ark25
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3
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2 answers
Why is the Emissivity of emission lines in unit erg.s-1.cm3?
The python package PyNeb could calculate the 'Emissivity' of an emission line at given electron temperature and density in unit "erg.s-1.cm3". But I don't know why Emissivity should in such an unit but not "erg.s-1.cm-3", what does this unit mean?
Stupid Boy
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What state of matter are nebulae in?
After doing research it said that nebulas are made of gas and dust. Are they actually gases and solids, or are they plasma?
StellarExile
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Did we discover how nebulae hold their shapes?
As you know, nebulae such as the Eagle Nebula, the Cat's Eye Nebula, and the Pillars of Creation, have extraordinary shapes. But have we discovered why that is so? I've tried researching it myself however all that comes up are theories of a…
spjy
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Eagle Nebula (Pillar of Creation) destroyed?
How do they know that the pillars have been destroyed if the light will reach us in 1000 years time?
The "Pillars of Creation" from the Eagle Nebula. Evidence from the
Spitzer Telescope suggests that the pillars may already have been
destroyed…
ACV
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Is this a real photo or an art work?
I've never seen this Hubble picture, is it an artist impression? It's fascinating because there are voids apparently cause by supernovae.
From the video 1 Hour of Epic Space Music: COSMOS - Volume 1
The deviant art mentioned in the information…
bandybabboon
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What is meant by "short lived" in the duration of a planetary nebula?
In this wikipedia article, it describes planetary nebula as "short-lived," but I'm not sure in relation to what? This could mean billions of years in some contexts.
How long is short-lived?
Bonus if there are any useful rules of thumb in astronomy…
Mikey
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