Starship Asterisk*

[quote="starstruck"]Thanks neufer. The background space has obviously been treated and added as a layer on this photo to make it look more acceptable. However, if you follow the link to the flickr page in the "above color-inverted image" link in the text, you can see the [url=http://www.flickr.com/photos/bads_photos/7695917240/in/photostream/]untreated negative image[/url] with the background space showing as white.[/quote]

In the information in Flickr that is brought up through the 'above color-inverted image' link in the explanation to the APOD it states the image was taken on August 5 2012 but very confusingly in the information with the 'untreated negative image' in Flickr it states it was taken on August 1 2012. I wonder which date is correct? I regularly see dates in Flickr accounts for when a photo was taken that must be wrong yet they never seem to be corrected.

For a beginner in this complex arena, I found this APOD with its description and the many links an exciting introduction to ideas and things that I hadn't known about before. Thanks !!!

"because they are weigh so little" Really?

[quote="Mactavish"]I assume that “color-inverted” means converted from color to black and white. So, why was this image color-inverted? Was there something to be gained? Can someone explain please? Personally, I would prefer to see the original color image.[/quote]
The image is described as made through a hydrogen-alpha filter, and is therefore a monochrome image. There is no color. (As noted elsewhere, "inverted" is used correctly to refer to inverting the black/white endpoints, effectively making what is commonly called a negative... although in this case with the background masked out of processing.)

Color could be added in post processing- for instance, by simulating the red color of Ha, but that would show less detail to the eye than this grayscale image. A pseudocolor palette could be used to enhance detail over the grayscale, of course, although that would alter the aesthetics.

1 - Why do you have to include pictures of cats in suglasses in your links, I mean come on, isn't tham meme dead and buried by now, and did it really have to infiltrate APOD? Aren't you guys better than that?

2 - Clouds on Earth are usually cooler than filaments on the Sun? Usually? Can you give me an example of a cloud on the Earth that comes close to that temperature?

3 - What is the point of the link in the word "right"? Does this have any relavence to the topic?

4 - What do you mean by "charged hydrogen gas"? Are you trying to say "plasma"?

I love APOD but it appears that the quality of the descriptions are starting to slide.

Thanks neufer. The background space has obviously been treated and added as a layer on this photo to make it look more acceptable. However, if you follow the link to the flickr page in the "above color-inverted image" link in the text, you can see the [url=http://www.flickr.com/photos/bads_photos/7695917240/in/photostream/]untreated negative image[/url] with the background space showing as white.

[float=right][img3=""]http://upload.wikimedia.org/wikipedia/commons/d/d7/HI6563_fulldisk.jpg[/img3][/float][quote="starstruck"][quote="Mactavish"]

I assume that “color-inverted” means converted from color to black and white. So, why was this image color-inverted? Was there something to be gained? Can someone explain please? Personally, I would prefer to see the original color image.[/quote]
I don't think this is a color-inverted image. It may be an inverted monochrome image, in which case it could be described as a negative, done to emphasise different tonal details.[/quote]
[b][color=#FF0000]Filaments seen with an H-alpha filter normally appear as dark features in the chromosphere (literally, "sphere of colour"). :arrow:

However, the APOD cannot be described as a simple negative because the background space is still dark.[/color][/b]

I don't think this is a color-inverted image. It may be an inverted monochrome image, in which case it could be described as a negative, done to emphasise different tonal details. Also, I am intrigued by when clouds above the Earth are not much cooler; usage of the term "usually" would seem to imply sometimes they are not . . a mushroom cloud maybe? Good image of an interesting phenomenon though.

The Chinese believed a Dragon ate the Moon for a Solar Eclipse explanation....NOW I SEE WHY....There IS a Dragon on the Sun.... :D

:---[===] *

I assume that “color-inverted” means converted from color to black and white. So, why was this image color-inverted? Was there something to be gained? Can someone explain please? Personally, I would prefer to see the original color image.

[url=http://apod.nasa.gov/apod/ap120820.html][img]http://apod.nasa.gov/apod/calendar/S_120820.jpg[/img] [size=150]A Filament Across the Sun[/size][/url]

[b] Explanation: [/b] Is that a cloud hovering over the Sun? Yes, but it is quite different than a cloud hovering over the Earth. The long light feature on the left of the [url=http://www.flickr.com/photos/bads_photos/7719395116/]above color-inverted image[/url] is actually a solar filament and is composed of mostly charged [url=http://periodic.lanl.gov/1.shtml]hydrogen[/url] gas held aloft by the Sun's [url=http://solar-center.stanford.edu/magnetism/magneticfields.html]looping magnetic field[/url]. By contrast, clouds over the Earth are usually much [url=http://patriciahansen55.info/wp-content/uploads/2011/11/CoolCats-lg.jpg]cooler[/url], composed mostly of tiny water droplets, and are [url=http://www.scientificamerican.com/article.cfm?id=why-do-clouds-float-when]held aloft[/url] by upward air motions because they are weigh so little. The above filament was captured on the Sun about two weeks ago near the [url=http://apod.nasa.gov/apod/ap120714.html]active solar[/url] region [url=https://www.youtube.com/watch?v=_Wp135SCCqo]AR 1535[/url] visible on the [url=https://plus.google.com/u/1/103211579003359376826/posts]ri[/url]ght with dark sunspots. [url=http://apod.nasa.gov/apod/ap101215.html]Filament[/url]s typically last for a few days to a week, but a long [url=http://en.wikipedia.org/wiki/Solar_prominence]filament[/url] like this might hover over the Sun's surface for a month or more. Some filaments trigger large [url=http://www.ips.gov.au/Educational/2/4/1]Hyder flares[/url] if they suddenly [url=https://www.youtube.com/watch?v=67RHwXBAXps]collapse back[/url] onto the Sun.

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