APOD: The Elusive Jellyfish Nebula (2010 May 15)

Post a reply


This question is a means of preventing automated form submissions by spambots.
Smilies
:D :) :ssmile: :( :o :shock: :? 8-) :lol2: :x :P :oops: :cry: :evil: :roll: :wink: :!: :?: :idea: :arrow: :| :mrgreen:
View more smilies

BBCode is ON
[img] is ON
[url] is ON
Smilies are ON

Topic review
   

Expand view Topic review: APOD: The Elusive Jellyfish Nebula (2010 May 15)

Re: The true source of the Geminids?

by bystander » Sun Dec 12, 2010 6:39 pm

The true source of the Geminids?

by neufer » Sun Dec 12, 2010 6:10 pm

http://www.universetoday.com/81623/wise-captures-an-infrared-shock-wave/ wrote:
WISE Captures an Infrared Shock Wave
by Nancy Atkinson on December 10, 2010
A JPL press release wrote: <<A circular rainbow appears like a halo around an exploded star in this new view of the IC 443 nebula from NASA’s Wide-field Infrared Survey Explorer, or WISE.

When massive stars die, they explode in tremendous blasts, called supernovae, which send out shock waves. The shock waves sweep up and heat surrounding gas and dust, creating supernova remnants like the one pictured here. The supernova in IC 443 happened somewhere between 5,000 and 10,000 years ago.

In this WISE image, infrared light has been color-coded to reveal what our eyes cannot see. The colors differ primarily because materials surrounding the supernova remnant vary in density. When the shock waves hit these materials, different gases were triggered to release a mix of infrared wavelengths.

The supernova remnant’s northeastern shell, seen here as the violet-colored semi-circle at top left, is composed of sheet-like filaments that are emitting light from iron, neon, silicon and oxygen gas atoms and dust particles heated by a fast shock wave traveling at about 100 kilometers per second, or 223,700 mph.

The smaller southern shell, seen in bright bluish colors, is constructed of clumps and knots primarily emitting light from hydrogen gas and dust heated by a slower shock wave traveling at about 30 kilometers per second, or 67,100 miles per hour. In the case of the southern shell, the shock wave is interacting with a nearby dense cloud. This cloud can be seen in the image as the greenish dust cutting across IC 443 from the northwest to southeast.

IC 443 lies near the star Eta Geminorum, which lies near Castor,
one of the twins in the constellation Gemini.>>

http://antwrp.gsfc.nasa.gov/apod/ap060602.html
http://antwrp.gsfc.nasa.gov/apod/ap030903.html
http://antwrp.gsfc.nasa.gov/apod/ap990721.html
http://antwrp.gsfc.nasa.gov/apod/ap970502.html

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

by Chris Peterson » Sun May 23, 2010 2:16 pm

tesla wrote:A neutron star is a mathematical assumption. It is not a known fact. It may fit our limited understanding at the moment, but that does not mean it exists.
A neutron star is a concept based on multiple lines of observational evidence, which combined make it almost certain to exist. That makes it far more than a "mathematical assumption".

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

by tesla » Sun May 23, 2010 10:06 am

A neutron star is a mathematical assumption. It is not a known fact. It may fit our limited understanding at the moment, but that does not mean it exists.

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

by DavidLeodis » Sun May 16, 2010 6:15 pm

Thanks 'bystander' for your help, which is appreciated. If you drink, have a :b: on me. :)

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

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

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

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.

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

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.

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

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:

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

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:

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

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??

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

by neufer » Sat May 15, 2010 11:18 pm

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

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

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

Quick, simple question

Re: ECAlogical

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

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

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

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:

ECAlogical

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

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

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.

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

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 :?:

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

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
editbutton.jpg (18.22 KiB) Viewed 5335 times

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

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??

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

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.>>

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

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:

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

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...

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

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

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

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

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"!

Top