Talk:Protoplanetary disk

message: I think the spelling of 'disc' should be changed to 'disk', both in the title of this page, and in all references.  In common american english usage, the word disk is usually spelled with a k.  The only common use of the c spelling is for compact discs.  Furthermore, in my astronomy background, in english publications I never see the word disk spelled with a c, whether its protoplanetary disk, accretion disk, disk of a spiral galaxy (galactic disk), etc. Myrrhlin 19:43, 17 March 2006 (UTC)
thread_title: Name change

message: In the same way that weather systems and hurricanes are spun. Is it not more feasible that the discs rotation is attributable to the distance from the galactic center on the inside of the disc to the outside of the disc?  
Whilst only approximately 8 light hours in diameter, making the relative distance negligible to the 28000 light years the sun is from the galactic center, the relative velocity of the upper and lower atmosphere also yield a negligible relative distance compared to the velocity at which weather systems rotate.  Yet in both cases, the relative velocity of rotation is about 10% of the orbital rotation, 120 km/h for wind with earths rotation of 1666 km/h, 100,000 km/h for the earth with the solar systems galactic orbital velocity of 828,000 km/h.  Did the protoplanetary hot disc behave more like a liquid or a gas?  Andrew M. Cross (talk) 13:54, 13 November 2015 (UTC)
thread_title:  Rotation 

message: I arrived at this page in the course of doing some research on the early solar system. What I'm looking for is some kind of characterization of the distribution of matter in a protoplanetary disk. I want to know how flat the disks usually are and how the material making them up is distributed. This would be very useful information to include in this article. Perhaps someone could augment the article by providing some information on this. Kevin Langdon 15:46, 26 April 2007 (UTC)
thread_title:  Shape, Density Gradient 

message: As these observations are mentioned in the article, someone might want to add a few images of these observations (30 images of proplyds in the Orion Nebula have been released), or a link to this gallery on Commons. Grand Schtroumpf (talk) 14:07, 19 December 2009 (UTC)
thread_title:  Hubble's recent observations 

message: Is there any discussion to be had on the development of ideas about the protoplanetary disc, if the idea was in place before such phenomenon was discovered? I think these are important questions to ask when it comes to astronomy, particularly cosmology. Giving us, not only meaningful background and history, but also insight into the workings of our scientific community. If anyone has this kind of information, please let me know --IronMaidenRocks (talk) 02:12, 21 November 2014 (UTC)
thread_title: Origin of theory and relation to discovery of phenomenon

message: The article says: "Protoplanetary disks are thought to be thin structures, with a typical vertical height much smaller than the radius, and a typical mass much smaller than the central young star." This looks wrong for several reasons. First, such disks were once modeled one-dimensionally, as if they were infinitely thin. The latest research suggests that they are more likely to be very, very thick. The second problem is the definition of "thin" given here, as vertical height very much smaller than the radius. That's a terrible definition of "thin" since even an extremely thick disk would fit that definition. Zyxwv99 (talk) 23:03, 25 March 2016 (UTC)
thread_title:  Thick or thin 

message: How does a system go from cloud of particles moving in a variety of directions, to a disc where most are rotating in the same plane in the same direction? Is it only through collisions and close encounters that angular momentum is averaged out into a net spin? Once a disc starts forming, does the gravity of the dominant plane exert sideways pull on the orbits of particles outside the plane until they all align?  I think I wrote that on a planetary science quiz once and got it marked wrong for one part or the other. This question has been bugging me for decades.  Beland (talk) 19:23, 28 September 2016 (UTC)
thread_title:  Mechanics of formation 

message: Hello fellow Wikipedians,
I have just modified one external link on Protoplanetary disk. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20141106220622/https://public.nrao.edu/static/pr/planet-formation-alma.html to https://public.nrao.edu/static/pr/planet-formation-alma.html
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 23:59, 21 January 2018 (UTC)
thread_title:  External links modified (January 2018)