by MarkBour » Sun Mar 17, 2019 12:32 am
Boomer12k wrote: ↑Sat Mar 16, 2019 7:50 am
Ann wrote: ↑Sat Mar 16, 2019 6:55 am
The NGC 3324 nebula.
NASA, ESA, and The Hubble Heritage Team (STScI/AURA)
I have to wonder what causes this remarkably long, sharp rim separating the dusty foreground from the hot, ionized near-vacuum "bubble" behind it. I guess we are seeing the outline of "Gabriella Mistral's nose" left of center in the Hubble picture at right.
The Hubble picture shows a few scattered stars which may be partly responsible for the ionization of the "bubble". You can see more of the stars inside the bubble in the APOD. The little cluster sure looks unimpressive, but the evacuated bubble and the dusty rim are impressive indeed.
Ann
Near sunset about a week ago...the sun shown on the tops of clouds...looked a lot like that...so amazing.
:---[===] *
I don't have any help to offer with what you're wondering, Ann. But your image also nicely highlights a related question I have. In many images like this one, the dust clouds have a feathery, bright, wispy edge region. As if the cloud of dust is giving off steam. These wispy edges certainly add to the beauty of the images, but what are they, actually?
Boomer, you noted a similar look for earthly cloud edges, lit by our Sun. But are these wispy edges in astronomical images of stellar dust clouds also backlit by stars behind the dust, or are they some other effect?
[quote=Boomer12k post_id=290637 time=1552722649 user_id=120851]
[quote=Ann post_id=290636 time=1552719340 user_id=129702]
[float=right][img2]https://cdn.spacetelescope.org/archives/images/screen/opo0834a.jpg[/img2][c][size=85]The NGC 3324 nebula.
NASA, ESA, and The Hubble Heritage Team (STScI/AURA)[/size][/c][/float]I have to wonder what causes this remarkably long, sharp rim separating the dusty foreground from the hot, ionized near-vacuum "bubble" behind it. I guess we are seeing the outline of "Gabriella Mistral's nose" left of center in the Hubble picture at right.
The Hubble picture shows a few scattered stars which may be partly responsible for the ionization of the "bubble". You can see more of the stars inside the bubble in the APOD. The little cluster sure looks unimpressive, but the evacuated bubble and the dusty rim are impressive indeed.
Ann
[/quote]
Near sunset about a week ago...the sun shown on the tops of clouds...looked a lot like that...so amazing.
:---[===] *
[/quote]
I don't have any help to offer with what you're wondering, Ann. But your image also nicely highlights a related question I have. In many images like this one, the dust clouds have a feathery, bright, wispy edge region. As if the cloud of dust is giving off steam. These wispy edges certainly add to the beauty of the images, but what are they, actually?
Boomer, you noted a similar look for earthly cloud edges, lit by our Sun. But are these wispy edges in astronomical images of stellar dust clouds also backlit by stars behind the dust, or are they some other effect?