APOD: The Elusive Jellyfish Nebula (2010 May 15)

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APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by APOD Robot » Sat May 15, 2010 3:51 am

Image The Elusive Jellyfish Nebula

Explanation: Normally faint and elusive, the Jellyfish Nebula is caught in this alluring, false-color, telescopic view. Flanked by two bright stars, Mu and Eta Geminorum, at the foot of a celestial twin, the Jellyfish Nebula is the brighter arcing ridge of emission with dangling tentacles below and right of center. In fact, the cosmic jellyfish is seen to be part of bubble-shaped supernova remnant IC 443, the expanding debris cloud from a massive star that exploded. Light from the explosion first reached planet Earth over 30,000 years ago. Like its cousin in astrophysical waters the Crab Nebula supernova remnant, IC 443 is known to harbor a neutron star, the remnant of the collapsed stellar core. Emission nebula Sharpless 249 fills the field at the upper left. The Jellyfish Nebula is about 5,000 light-years away. At that distance, this image would be about 300 light-years across. The color scheme used in the narrowband composite was made popular in Hubble Space Telescope images, mapping emission from oxygen, hydrogen, and sulfur atoms to blue, green and red colors.

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Astronut

Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Astronut » Sat May 15, 2010 4:55 am

Jellyfish? -- No way Hose :!:
But i do like it. It looks like there is something going on there, but i don't know just what. If :mrgreen: knows, He's not talking.
Maybe I'll have to jump into my :rocketship: and go have a looksee. Now, where did I put those keys.......

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by neufer » Sat May 15, 2010 11:18 am

http://en.wikipedia.org/wiki/Atavism wrote:
Early embryos of various species display some ancestral feature, like the tail on this human fetus.
Image

The term atavism (derived from the Latin atavus, a great-grandfather's grandfather; more generally, an ancestor) denotes the tendency to revert to ancestral type. An atavism is an evolutionary throwback, such as traits reappearing which had disappeared generations ago. Atavisms occur because genes for previously existing phenotypical features are often preserved in DNA, even though the genes are not expressed in some or most of the organisms possessing them.

Examples observed include:

* hind legs on whales
* hind fins on dolphins
* hind legs on snakes
* extra toes on horses, as in archaic horses
* Teeth in chickens

Atavisms have been observed in humans as well. Babies have been born with a vestigial tail, called "coccygeal process", "coccygeal projection", and "caudal appendage". It can also be evidenced in humans who possess large teeth, like those of other primates.

* Humans with extra nipples (Multiple breast syndrome)
* Humans with large canine teeth

During the interval between the acceptance of evolution and the rise of modern understanding of genetics, atavism was used to account for the reappearance in an individual of a trait after several generations of absence. Such an individual was sometimes called a "throwback". The term is often used in connection with the unexpected reappearance of primitive traits in organisms.>>
Art Neuendorffer

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Hofi » Sat May 15, 2010 12:02 pm

Really amazing picture!
You see how much you can get out of an image by computer processing!
Best wishes,
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Astronut

Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Astronut » Sat May 15, 2010 12:39 pm

Hey guys, I'm not really sure who's in charge of selecting the posts for this site about Outer Space, but seeing as how once in a while we get to see some pictures of 'Middle Space' (Earth) -- How about some pictures of 'Inner Space'?

What if there was a series of pictures taken of a small reconizeable object that was zoomed in on by the Hubble Inner Space equivalent - the Electron microscope.

I know that many years ago they were able to see the electrical field around a single Atom and were actually makeing little motors or the like out of single Atoms.

We just may find that 'Inner Space' is just as big and vast in its own way as Outer Space seems to be, from our point of view from the Middle.

Just an :?:

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by biddie67 » Sat May 15, 2010 12:51 pm

What a beautiful picture!! I've been sitting here, soaking it up ....

The information behind the "mapping emission" link above was very interesting - the results from false/enhanced color processing are amazing.

Also the picture of the early stage of a fetus is disquieting - so many little pieces to be put in place from such a strange-looking beginning. It's a miracle that we generally end up looking like we do upon birth ..... But I can attest - I wish that there were an easier way to give birth - maybe some kind of convenient organic "duffle-bag-like zipper"!

Astronut

Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Astronut » Sat May 15, 2010 12:57 pm

Hey guys, does anyone know where they hid the edit button :?:

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Hofi » Sat May 15, 2010 1:09 pm

Astronut wrote:Hey guys, does anyone know where they hid the edit button :?:
According to my information, you can only edit your posts during a certain time after posting. But don't post such things here, you may contact bystander or any other moderator...
Last edited by Hofi on Sat May 15, 2010 1:25 pm, edited 1 time in total.
Best wishes,
Thomas Hofstätter

http://hidden-space.at.tf

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by orin stepanek » Sat May 15, 2010 1:23 pm

Astronut wrote:Hey guys, does anyone know where they hid the edit button :?:
Hi! I believe you need to be registered and logged on! :? You can then edit an error on your own post. :wink:
Orin

Smile today; tomorrow's another day!

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by neufer » Sat May 15, 2010 1:32 pm

Hofi wrote:
Astronut wrote:Hey guys, does anyone know where they hid the edit button :?:
According to my Information, you can only edit your posts during a certain time after posting.
24 hours seems to be the limit; I usually get all my editing done within the first hour and often I can barely remember what I posted yesterday.
http://asterisk.apod.com/faq.php#f2r1 wrote:
How do I edit or delete a post?

<<Unless you are a board administrator or moderator, you can only edit or delete your own posts. You can edit a post by clicking the edit button for the relevant post, sometimes for only a limited time after the post was made. If someone has already replied to the post, you will find a small piece of text output below the post when you return to the topic which lists the number of times you edited it along with the date and time. This will only appear if someone has made a reply; it will not appear if a moderator or administrator edited the post, though they may leave a note as to why they’ve edited the post at their own digression. Please note that normal users cannot delete a post once someone has replied.>>
Art Neuendorffer

Astronut

Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Astronut » Sat May 15, 2010 2:47 pm

For those of you who HAVE edited a post -- just where is the edit post button located??

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Chris Peterson » Sat May 15, 2010 3:02 pm

Astronut wrote:For those of you who HAVE edited a post -- just where is the edit post button located??
At the top right of the post, just left of the "quote" and "report abuse" icons.
editbutton.jpg
You do not have the required permissions to view the files attached to this post.
Chris

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Beyond » Sat May 15, 2010 3:21 pm

Thanks Chris. I now seem to be caught somewhere between Astronut and my first user name BEYOND. I now have options at the bottom of the page, but do not have the edit and report buttons that are at the top of the page.
I'm going to have to go through this stuff again and maybe it will come out right.
The last desk top i had, i took it and my .45's out back and shot it :!: , but this Dell is more expensive so i refrain my self from having fun.

Seeing as how you are an expert cloud angler, might i enquire if you use a damp or a dripping wet sponge for bait :?: and what is the largest cloud you've ever angled :?:
To find the Truth, you must go Beyond.

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Chris Peterson » Sat May 15, 2010 3:36 pm

beyond wrote:Seeing as how you are an expert cloud angler, might i enquire if you use a damp or a dripping wet sponge for bait :?: and what is the largest cloud you've ever angled :?:
I use only the best bait for clouds: expensive astronomical equipment. The more expensive, the more clouds.
Chris

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ECAlogical

Post by neufer » Sat May 15, 2010 5:56 pm

Chris (Expert Cloud Angler) Peterson wrote:
beyond wrote:Seeing as how you are an expert cloud angler, might i Inquire if you use a damp
or a dripping wet sponge for bait :?: and what is the largest cloud you've ever angled :?:
I use only the best bait for clouds: expensive astronomical equipment.
The more expensive, the more clouds.
  • -------------------------------------------
    ___ Much Ado About Nothing Act 3, Scene 1

    URSULA: The pleasant'st angling is to see the fish
    ___ Cut with her golden oars the silver stream,
    ___ And greedily devour the treacherous bait:
    -------------------------------------------
    ___ The Two Gentlemen of Verona Act 1, Scene 3

    PROTEUS: And by and by a cloud takes all away!
    -------------------------------------------
Art (Master Cloud Baiter) Neuendorffer

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Beyond » Sat May 15, 2010 7:53 pm

Gee guys, i asked a simple question about clouds and now Shakespear is being spoken. You guys are starting to take this stuff way to cirrusly :!: -- :lol:
To find the Truth, you must go Beyond.

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Re: ECAlogical

Post by bystander » Sat May 15, 2010 8:04 pm

neufer wrote:Art (Master Cloud Baiter) Neuendorffer
:? :facepalm:

jonbocz

Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by jonbocz » Sat May 15, 2010 11:11 pm

Quick, simple question

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by neufer » Sat May 15, 2010 11:18 pm

jonbocz wrote:
Quick, simple question
Quick, simple answer: 5.
Art Neuendorffer

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Beyond » Sun May 16, 2010 12:54 am

5 is not a quick simple answer! It is an odd number. Odd numbers are not simple. Even numbers are simple.
However, two odds make a simple right answer if they are equal to 2x50% of the even number equivalent. Simple - is'nt it??
To find the Truth, you must go Beyond.

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by neufer » Sun May 16, 2010 3:11 am

beyond wrote:5 is not a quick simple answer! It is an odd number. Odd numbers are not simple. Even numbers are simple.
However, two odds make a simple right answer if they are equal to 2x50% of the even number equivalent. Simple - is'nt it??
<<A number n is called simple number if the product of its proper divisors is less than or equal to n. For example: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 33, 34, 35, 37, 38, 39, 41, 43, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 62, 65, 67, 69, 71, 73, 74, 77, 79, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 101, 103, 106,....>>

The A5 alternating group (i.e., the even permutations of 5 objects) is the simplest of the finite alternating simple groups.
A5 is isomorphic to the icosahedral rotation group (i.e., I of order 60):
Image
  • Simple - isn't it?? :wink:
Art Neuendorffer

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by Beyond » Sun May 16, 2010 3:51 am

I think we really need a tounge-in-cheek smiley so the Quotationist does not get us!! :lol:
To find the Truth, you must go Beyond.

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by neufer » Sun May 16, 2010 3:40 pm

beyond wrote:I think we really need a tounge-in-cheek smiley so the Quotationist does not get us!! :lol:
  • Mark Chapter 7:35 (1526 Tyndale): And streyght waye his eares were openned
    and the stringe of his tounge was loosed and he spake playne.
Art Neuendorffer

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by DavidLeodis » Sun May 16, 2010 5:42 pm

I'm confused as to which area actually is Sharpless 249. The explanation states "Emission nebula Sharpless 249 fills the field at the upper left", which would seem to make it the pale blue area. However, in the information about the image that is brought up through the 'this alluring, false-color' link it seems to imply that Sharpless 249 covers the green and blue areas. I would appreciate it if anyone can let me know which is Sharpless 249. :?: Thanks.

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Re: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post by bystander » Sun May 16, 2010 6:04 pm

I think it is the entire green and blue area.

http://www.sharplesscatalog.com/sharpless/SH2-249.aspx