APOD: The Medusa Nebula (2010 Jun 12)

Comments and questions about the APOD on the main view screen.
Post Reply
User avatar
APOD Robot
Otto Posterman
Posts: 5374
Joined: Fri Dec 04, 2009 3:27 am
Contact:

APOD: The Medusa Nebula (2010 Jun 12)

Post by APOD Robot » Sat Jun 12, 2010 4:05 am

Image The Medusa Nebula

Explanation: Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun, as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. Ultraviolet radiation from the hot star powers the nebular glow. The Medusa's transforming star is near the center of the overall bright crescent shape. In this deep, wide telescopic view, fainter filaments clearly extend below and to the left of the bright crescent region. The Medusa Nebula is estimated to be over 4 light-years across.

<< Previous APODDiscuss Any APOD Next APOD >>
[/b]

User avatar
Ann
4725 Å
Posts: 13429
Joined: Sat May 29, 2010 5:33 am

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by Ann » Sat Jun 12, 2010 6:47 am

I'm trying to make it to a hundred posts and earn my green ears as a science officer, so... here is a bad hair day for Medusa!

Image

Ann
Color Commentator

User avatar
hstarbuck
Ensign
Posts: 98
Joined: Wed Mar 03, 2010 7:59 pm
Location: Hawaii

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by hstarbuck » Sat Jun 12, 2010 7:37 am

Ann wrote:I'm trying to make it to a hundred posts and earn my green ears as a science officer, so... here is a bad hair day for Medusa!

Ann
I'm working on 50 and then I will slow down--NOT!
Image
From 1981 Clash of the Titans at http://crashlanden.files.wordpress.com/ ... medusa.jpg

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by Beyond » Sat Jun 12, 2010 10:21 am

I just can't think of a thing to say except - eewww!!! - where's a Kraken when you need one :?:
To find the Truth, you must go Beyond.

User avatar
rstevenson
Quis custodiet ipsos custodes?
Posts: 2705
Joined: Fri Mar 28, 2008 1:24 pm
Location: Halifax, NS, Canada

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by rstevenson » Sat Jun 12, 2010 11:22 am

Medusa -- updated.

Rob
2861_1431_bad-hair-day.jpg
2861_1431_bad-hair-day.jpg (16.68 KiB) Viewed 3502 times

Texas City

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by Texas City » Sat Jun 12, 2010 11:46 am

I ate a spearmint leaf
And thought I had my fill of mints
That bad hair with pulverized planets
Grandstar

User avatar
neufer
Vacationer at Tralfamadore
Posts: 18805
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by neufer » Sat Jun 12, 2010 12:06 pm

APOD Robot wrote:Image The Medusa Nebula

Like its mythological namesake, the nebula is associated with a dramatic transformation.
http://en.wikipedia.org/wiki/Medusa wrote:
In Ovid (Metamorphoses 4.770), Medusa was originally a beautiful maiden, "the jealous aspiration of many suitors," priestess in Athena's temple, but when she and the "Lord of the Sea" Poseidon lay together in Athena's temple, the enraged Athena transformed Medusa's beautiful hair to serpents and made her face so terrible to behold that the mere sight of it would turn onlookers to stone. While Medusa was pregnant by Poseidon, god of the sea, she was beheaded by the hero Perseus, who was sent to fetch her head by King Polydectes of Seriphus as a gift. With help from Athena and Hermes who supplied him with winged sandals, Hades' cap of invisibility, a sword, and a mirrored shield, he accomplished his quest.

The hero slew Medusa by looking at her harmless reflection in a mirror
instead of directly at her to prevent being turned into stone:
http://bf-astro.com/outhouse.htm wrote:
Bob Franke's Old (Seattle) Observatory (a.k.a. Outhaus-West)
ImageImage
When the hero sEVERED Medusa's head from her neck, two offspring sprang forth:
the winged horse Pegasus and the golden giant Chrysaor.

In Odyssey xi, Homer does not specifically mention the Gorgon Medusa:
  • "Lest for my daring Persephone the dread,
    From Hades should send up an awful monster's grisly head.
    "
Image
http://en.wikipedia.org/wiki/Gorgonzola_%28cheese%29 wrote:
<<Gorgonzola is a veined Italian blue cheese, made from unskimmed cow's and/or goat's milk. It can be buttery or firm, crumbly and quite salty, with a 'bite' from its blue veining. It has been made since the early Middle Ages, but became marbled with greenish-blue mold only in the eleventh century. Gorgonzola is made in the regions of Piedmont and Lombardy from whole cow's milk, to which is added lactic acid bacteria, along with spores of the mold Penicillium glaucum.>>
Art Neuendorffer

biddie67
Science Officer
Posts: 483
Joined: Sun Jan 31, 2010 9:44 am
Location: Possum Hollow, NW Florida

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by biddie67 » Sat Jun 12, 2010 2:03 pm

Good Grief - those Greek Gods had such a difficult social life .......


P.S. The nebula reminds me of those fabulous back-lit "dancing waters" displays that you can see around in tourist areas.

User avatar
neufer
Vacationer at Tralfamadore
Posts: 18805
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by neufer » Sat Jun 12, 2010 2:15 pm

biddie67 wrote:The nebula reminds me of those fabulous back-lit "dancing waters" displays that you can see around in tourist areas.
[youtube]http://www.youtube.com/watch?v=vfX4QHKj ... re=related[/youtube]
Art Neuendorffer

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by DavidLeodis » Sun Jun 13, 2010 5:10 pm

I like the image. Simple and uncluttered.

I also learnt something! Through the "radiation" link I found out that microwaves (as in a microwave oven) are lower frequency than visible light waves. As microwaves cook food very fast I would have guessed they were higher frequency and I would also have guessed that higher frequency meant more powerful. Apologies to the scientists among you all for my lack of what is probably basic knowledge. I shall hang my head in shame for not knowing. :) :oops:

User avatar
Chris Peterson
Abominable Snowman
Posts: 18185
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA
Contact:

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by Chris Peterson » Sun Jun 13, 2010 5:37 pm

DavidLeodis wrote:I also learnt something! Through the "radiation" link I found out that microwaves (as in a microwave oven) are lower frequency than visible light waves.
It might be helpful to remember that the microwave background we see all around us is redshifted light. That is, we are seeing energy that was emitted around the wavelength of visible light, and has been stretched into microwaves by 13.7 billion years of cosmic expansion.
As microwaves cook food very fast I would have guessed they were higher frequency and I would also have guessed that higher frequency meant more powerful.
Higher frequency photons are more energetic than lower frequency ones. But the total energy depends not just on the frequency, but the intensity. To further complicate things, the reason that microwaves are so effective at heating food is because their wavelength corresponds to a frequency that dipolar molecules (like water) readily absorb.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
https://www.cloudbait.com

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: The Medusa Nebula (2010 Jun 12)

Post by DavidLeodis » Sun Jun 13, 2010 5:57 pm

Thanks Chris for your reply.

What particular radiation wavelengths can do still amazes me. For example I'm always in awe that I can turn on my TV and see images or switch on a light socket and there is light! I'll clearly never make it as a scientist, though I think I'm well past that stage now anyhow! :)

Post Reply