by Ann » Sun Aug 27, 2017 10:35 am
Boomer12k wrote:Striking image... love it when they say "OXYGEN"... I always find that interesting, and thrilling for some reason... I guess because before too long ago, it never really OCCURRED TO ME... the significance of that .... Cold water, ICE... the elements are made in HOT STARS... go figure.... it still stuns me, amazes me.
Oxygen is the third most common element in the Universe. Even though there is so much less oxygen than hydrogen and helium, there is still enormous amounts of it in the universe. There can be no doubt that there are huge, huge numbers of water molecules and OH molecules in the Universe. But the question is, how much of this cosmic water is in liquid form?
The Heart Nebula in RGB. Photo: Bob Franke.
That said, I suspect that the Hubble mapped color palette rather exaggerates the brightness of OIII emission in ordinary emission nebulas. At right is a photo of the Heart Nebula in RGB (red, green and blue filters). The bright blue or blue-green nebulosity seen in today's OIII, Hα and SII APOD is totally swamped by the red emission of Hα in Bob Frankes image.
Ann
[quote="Boomer12k"]Striking image... love it when they say "OXYGEN"... I always find that interesting, and thrilling for some reason... I guess because before too long ago, it never really OCCURRED TO ME... the significance of that .... Cold water, ICE... the elements are made in HOT STARS... go figure.... it still stuns me, amazes me.
[/quote]
[float=left][img2]http://68.media.tumblr.com/tumblr_l28g56DPvr1qbtjkwo1_1280.png[/img2][c][size=85]Oxygen is the third most common element in the Universe.
Source: http://clearscience.tumblr.com/page/40[/size][/c][/float] Oxygen is the third most common element in the Universe. Even though there is so much less oxygen than hydrogen and helium, there is still enormous amounts of it in the universe. There can be no doubt that there are huge, huge numbers of water molecules and OH molecules in the Universe. But the question is, how much of this cosmic water is in liquid form?
[float=right][img2]https://scontent.cdninstagram.com/t/s640x640/18253010_1395505297155619_4371349539852910592_n.jpg[/img2][c][size=85]The Heart Nebula in RGB. Photo: Bob Franke.[/size][/c][/float]
That said, I suspect that the Hubble mapped color palette rather exaggerates the brightness of OIII emission in ordinary emission nebulas. At right is a photo of the Heart Nebula in RGB (red, green and blue filters). The bright blue or blue-green nebulosity seen in today's OIII, Hα and SII APOD is totally swamped by the red emission of Hα in Bob Frankes image.
Ann