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toothdust
2008-Nov-14, 12:42 AM
What the heck are these things?

Edit: Link. (http://antwrp.gsfc.nasa.gov/apod/ap081113.html) Picture insert not working....

From the NASA astronomy picture of the day.

I thought most nebulas were from erratic, violent explosions, which results in what we see with most other nebulas, un-uniformity. This one possesses perfectly circular (if not spherical (can/have they imaged that?)) geometry, and appears to be smoothly transparent, most likely showing spherical homogeneity. It is a bit darker closer to the edges, what one would expect when looking through a sphere.

Is this something new?

I know they are saying nebula, maybe for lack of a better word?

A little bit of "artificial" jumped out at me too. :shhh: Probably just me being excited about something new.

PraedSt
2008-Nov-14, 01:20 AM
Bizarre things! I found it hard to see on that APOD page (it's dark green on black). Slightly easier here (http://www.lostvalleyobservatory.com/page29crescentbubblenb/). They're very strange, aren't they? APOD has a freakier one here (http://antwrp.gsfc.nasa.gov/apod/ap010123.html). It says
sun-like star's outer atmosphere expelled thousands of years agoThanks toothdust.

toothdust
2008-Nov-14, 02:02 AM
Seems like some stars go BANG!, while some whimper out with a pfff....

The second one you linked to seems more irregular that the Cygnus one, then again it is imaged larger.

PraedSt
2008-Nov-14, 02:13 AM
I think they look like jellyfish :shifty:

slang
2008-Nov-14, 08:11 AM
Seems like some stars go BANG!, while some whimper out with a pfff....

IMHO the Wiki article on Stellar Evolution (http://en.wikipedia.org/wiki/Stellar_evolution) gives some great insight in the many factors that affect the death of stars. (The usual warnings on it being Wiki 'n all apply!)