Comments on: The Milky Way Has Only Two Spiral Arms http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/ Space and astronomy news Sat, 21 Nov 2009 21:17:24 -0600 http://wordpress.org/?v=2.8.6 hourly 1 By: Shabiq http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-24687 Shabiq Fri, 27 Jun 2008 08:49:32 +0000 http://www.universetoday.com/?p=14694#comment-24687 Hey!! the astronomers are right, there are four arms(not exacty four,its more than four) not two because there are two star cluster in our galaxy, one in which new stars are formed and the other in which new stars are not formed.They have no gases, dust particles to form stars.So the density in stars towards the Scutum-Centaurus Arm increases, but do not increases towards the Sagittarius and Norma arms. Hey!! the astronomers are right, there are four arms(not exacty four,its more than four) not two because there are two star cluster in our galaxy, one in which new stars are formed and the other in which new stars are not formed.They have no gases, dust particles to form stars.So the density in stars towards the Scutum-Centaurus Arm increases, but do not increases towards the Sagittarius and Norma arms.

]]> By: El Sofista - La Vía Láctea sólo tiene dos brazos espirales http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22841 El Sofista - La Vía Láctea sólo tiene dos brazos espirales Thu, 05 Jun 2008 19:45:38 +0000 http://www.universetoday.com/?p=14694#comment-22841 Si alguien nunca hubiera salido de su casa, no sabría cómo ésta se ve desde el exterior. Esa es la situación con la Vía Láctea. Estamos en su interior, así que en realidad no sabemos cuál es el aspecto de su estructura. Hay otros ejemplos de grandes espirales que podemos ver, pero eso es como ver otras casas desde la ventana de la nuestra y eso no permite asegurarnos de nada. [...] Fuente: Fraser Cain para Universe Today, y NASA/JPL. Si alguien nunca hubiera salido de su casa, no sabría cómo ésta se ve desde el exterior. Esa es la situación con la Vía Láctea. Estamos en su interior, así que en realidad no sabemos cuál es el aspecto de su estructura. Hay otros ejemplos de grandes espirales que podemos ver, pero eso es como ver otras casas desde la ventana de la nuestra y eso no permite asegurarnos de nada. [...] Fuente: Fraser Cain para Universe Today, y NASA/JPL.

]]> By: Jon Hanford http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22788 Jon Hanford Thu, 05 Jun 2008 02:23:40 +0000 http://www.universetoday.com/?p=14694#comment-22788 Check out the annotated version of this pic at the Spitzer Space Telescope site. This makes a good T-shirt version of 'Where am I ?' (i.e. 'Sun') Check out the annotated version of this pic at the Spitzer Space Telescope site. This makes a good T-shirt version of 'Where am I ?' (i.e. 'Sun')

]]> By: neoguru http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22762 neoguru Wed, 04 Jun 2008 17:55:41 +0000 http://www.universetoday.com/?p=14694#comment-22762 LLDIAZ is correct. The extinction theory involves passing in and out of the plane of the galaxy, not the arms. LLDIAZ is correct. The extinction theory involves passing in and out of the plane of the galaxy, not the arms.

]]> By: Aodhhan http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22758 Aodhhan Wed, 04 Jun 2008 16:29:12 +0000 http://www.universetoday.com/?p=14694#comment-22758 This hasn't put any old theories to bed. It will surely spark a whole mess of new ones. This hasn't put any old theories to bed. It will surely spark a whole mess of new ones.

]]> By: Astrofreak http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22747 Astrofreak Wed, 04 Jun 2008 14:32:37 +0000 http://www.universetoday.com/?p=14694#comment-22747 Hey Fraser, u turn over a new leaf? Ha! I didn't find a single "might, could, may" et. al. in this story. I always heard we live nearby the "Orion Arm" but are not a part of it. Hey Fraser, u turn over a new leaf? Ha! I didn't find a single "might, could, may" et. al. in this story. I always heard we live nearby the "Orion Arm" but are not a part of it.

]]> By: LLDIAZ http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22742 LLDIAZ Wed, 04 Jun 2008 13:07:24 +0000 http://www.universetoday.com/?p=14694#comment-22742 I thought the theory was when we moved in and out of the galactic plain we were less protected not spiral arms. I thought the theory was when we moved in and out of the galactic plain we were less protected not spiral arms.

]]> By: Jon http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22735 Jon Wed, 04 Jun 2008 12:06:40 +0000 http://www.universetoday.com/?p=14694#comment-22735 Hey Sili, I'll take that bet on mass-extinctions due to passing through spiral arms. Looking at the new picture of the Milky Way there sure seems to still be plenty of major and minor arms for the solar system to past through as it orbits around the center of the galaxy. Did you look at the new picture of the Milky Way at the begining of the article? Although I'm not one of those people, I think this does not disprove their hypothesis. Care to elaborate on why you think otherwise? Hey Sili,

I'll take that bet on mass-extinctions due to passing through spiral arms. Looking at the new picture of the Milky Way there sure seems to still be plenty of major and minor arms for the solar system to past through as it orbits around the center of the galaxy. Did you look at the new picture of the Milky Way at the begining of the article?

Although I'm not one of those people, I think this does not disprove their hypothesis. Care to elaborate on why you think otherwise?

]]> By: Vagueofgodalming http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22729 Vagueofgodalming Wed, 04 Jun 2008 11:04:49 +0000 http://www.universetoday.com/?p=14694#comment-22729 It would be nice to have a diagram with the arms labelled, showing the old and new interpretations. JPL don't seem to have published one. It would be nice to have a diagram with the arms labelled, showing the old and new interpretations. JPL don't seem to have published one.

]]> By: alphonso richardson http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22724 alphonso richardson Wed, 04 Jun 2008 10:04:17 +0000 http://www.universetoday.com/?p=14694#comment-22724 Oh well.................. Oh well………………

]]> By: GBendt http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22718 GBendt Wed, 04 Jun 2008 08:04:21 +0000 http://www.universetoday.com/?p=14694#comment-22718 Since several years it is known that our Milky Way is a barred spiral galaxy. As barred spiral galaxies have two spiral arms, our home galaxy has two spiral arms, too. NGC1365 gives a good impression of the look spectators from outside have on our Milky Way . When the first maps of our galaxy were drawn some 60 years ago, the ability to interpret radio measurements was not that advanced than it is today, but these maps were a good to begin with. Any idea someone has about our Milky way is necessarily based on the knowledge that he or she has. If some new findings increase the knowledge, someone´s idea of the Milky Way has to adapt respectively. The last centuries of astronomical investigations came along with a permanent change of the contemporary idea of the structure our galaxy and the universe. This process of continuing change has not yet ended: I think it is really starting right now. Regards, Günther Since several years it is known that our Milky Way is a barred spiral galaxy. As barred spiral galaxies have two spiral arms, our home galaxy has two spiral arms, too.

NGC1365 gives a good impression of the look spectators from outside have on our Milky Way .

When the first maps of our galaxy were drawn some 60 years ago, the ability to interpret radio measurements was not that advanced than it is today, but these maps were a good to begin with.

Any idea someone has about our Milky way is necessarily based on the knowledge that he or she has. If some new findings increase the knowledge, someone´s idea of the Milky Way has to adapt respectively.

The last centuries of astronomical investigations came along with a permanent change of the contemporary idea of the structure our galaxy and the universe. This process of continuing change has not yet ended: I think it is really starting right now.

Regards,

Günther

]]> By: tim http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22702 tim Wed, 04 Jun 2008 01:55:52 +0000 http://www.universetoday.com/?p=14694#comment-22702 That news really bums me out, and at the same time peaks my interest at the idea of living in an entirely different looking galaxy than we'd been taught to believe. I guess my milkyway-galaxy, laser etched desk crystal is now a collectors item. I feel ripped off too, I want another. Lol. That news really bums me out, and at the same time peaks my interest at the idea of living in an entirely different looking galaxy than we'd been taught to believe. I guess my milkyway-galaxy, laser etched desk crystal is now a collectors item. I feel ripped off too, I want another. Lol.

]]> By: Quantum_Flux http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22685 Quantum_Flux Tue, 03 Jun 2008 21:42:49 +0000 http://www.universetoday.com/?p=14694#comment-22685 correction: Unless that happens to be an elongated meatball on a spinning fork in the center correction: Unless that happens to be an elongated meatball on a spinning fork in the center

]]> By: Quantum_Flux http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22684 Quantum_Flux Tue, 03 Jun 2008 21:41:29 +0000 http://www.universetoday.com/?p=14694#comment-22684 I suppose we can safely say that Vishnu didn't create our galaxy in his image then because there are two few arms and legs. Nor did Jeebus for that matter because there are two few legs, and certainly our galaxy doesn't even slightly resemble FSM unless that happens to be an elongated meatball in the center :) I suppose we can safely say that Vishnu didn't create our galaxy in his image then because there are two few arms and legs. Nor did Jeebus for that matter because there are two few legs, and certainly our galaxy doesn't even slightly resemble FSM unless that happens to be an elongated meatball in the center :)

]]> By: Neil http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22679 Neil Tue, 03 Jun 2008 20:24:03 +0000 http://www.universetoday.com/?p=14694#comment-22679 definatly not funny! definatly not funny!

]]> By: owen http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22678 owen Tue, 03 Jun 2008 20:23:50 +0000 http://www.universetoday.com/?p=14694#comment-22678 very interesting! very interesting!

]]> By: Mek http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22677 Mek Tue, 03 Jun 2008 20:17:51 +0000 http://www.universetoday.com/?p=14694#comment-22677 Hahahaha @ tacitus :) How will they reconcile the infra-red observations with the radio ones? Hahahaha @ tacitus :)

How will they reconcile the infra-red observations with the radio ones?

]]> By: tacitus http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22675 tacitus Tue, 03 Jun 2008 20:01:48 +0000 http://www.universetoday.com/?p=14694#comment-22675 Does that mean that the Milky Way can now be reclassified as "Mostly Armless?" Does that mean that the Milky Way can now be reclassified as "Mostly Armless?"

]]> By: Sili http://www.universetoday.com/2008/06/03/the-milky-way-has-only-two-spiral-arms/comment-page-1/#comment-22674 Sili Tue, 03 Jun 2008 19:59:25 +0000 http://www.universetoday.com/?p=14694#comment-22674 What do you wanna bet that this won't shut up the people who claim that mass-extinctions are due to our passing through an arm? What do you wanna bet that this won't shut up the people who claim that mass-extinctions are due to our passing through an arm?

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