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- DR_21 abstract "DR 21 is a huge molecular cloud located in the constellation Cygnus. This cloud is located about 6,000 light-years (1,800 pc) from Earth and extends for 80 light-years (25 pc). The region contains a high rate of star formation and is associated with the Cygnus X star forming region. It has an estimated mass of 1,000,000 M☉.A number of different molecules have been detected in the region by their radio emission, including formaldehyde, ammonia, water and carbon monoxide.In this region, some of the most massive stars in the Milky Way have been observed. DR 21 contains complex patterns of dust and gas, which glow in the infrared due to the presence of organic compounds known as polycyclic aromatic hydrocarbons. Jagged patterns within DR 21 result from interactions with interstellar wind, radiation pressure, magnetic fields, and gravity.An estimated population of 2,900 stars have been formed in this molecular cloud, similar to the population of the Orion Nebula cluster, which are distributed in groups associated with cloud clumps. Feedback from the massive stars may ultimately disrupt the cloud; however, this has not happened yet due to the region's extreme youth. Study of these stars by the Spitzer Space Telescope has shown signs of protoplanetary disks.".
- DR_21 thumbnail Stars_in_the_DR21_Region.jpg_(crop).jpg?width=300.
- DR_21 wikiPageExternalLink ap040414.html.
- DR_21 wikiPageExternalLink PIA05736.
- DR_21 wikiPageExternalLink sim-id?Ident=DR+21.
- DR_21 wikiPageExternalLink 161-ssc2004-06-Invisible-Giants-Exposed-in-New-Spitzer-Image.
- DR_21 wikiPageID "33860947".
- DR_21 wikiPageLength "5023".
- DR_21 wikiPageOutDegree "23".
- DR_21 wikiPageRevisionID "696728110".
- DR_21 wikiPageWikiLink Ammonia.
- DR_21 wikiPageWikiLink Astronomy_Picture_of_the_Day.
- DR_21 wikiPageWikiLink Carbon_monoxide.
- DR_21 wikiPageWikiLink Category:Cygnus_(constellation).
- DR_21 wikiPageWikiLink Category:Emission_nebulae.
- DR_21 wikiPageWikiLink Category:Molecular_clouds.
- DR_21 wikiPageWikiLink Cygnus_(constellation).
- DR_21 wikiPageWikiLink Cygnus_X_(star_complex).
- DR_21 wikiPageWikiLink Emission_nebula.
- DR_21 wikiPageWikiLink Epoch_(astronomy).
- DR_21 wikiPageWikiLink Formaldehyde.
- DR_21 wikiPageWikiLink Gravity.
- DR_21 wikiPageWikiLink Infrared.
- DR_21 wikiPageWikiLink Interstellar_medium.
- DR_21 wikiPageWikiLink Magnetic_field.
- DR_21 wikiPageWikiLink Molecular_cloud.
- DR_21 wikiPageWikiLink Orion_Nebula.
- DR_21 wikiPageWikiLink Polycyclic_aromatic_hydrocarbon.
- DR_21 wikiPageWikiLink Radiation_pressure.
- DR_21 wikiPageWikiLink SIMBAD.
- DR_21 wikiPageWikiLink Star_formation.
- DR_21 wikiPageWikiLink Water.
- DR_21 caption "Infrared view of the DR 21 molecular cloud".
- DR_21 constellation Cygnus_(constellation).
- DR_21 distLy "6000".
- DR_21 distPc "1800".
- DR_21 epoch Epoch_(astronomy).
- DR_21 imageSize "275".
- DR_21 name "DR 21".
- DR_21 names ",".
- DR_21 names "18".
- DR_21 names "36".
- DR_21 names "GAL 081.681+00.54".
- DR_21 names "GRS G081.70 +00.50".
- DR_21 names "RAFGL 2624".
- DR_21 names "W 75".
- DR_21 subtype Emission_nebula.
- DR_21 type "Molecular cloud".
- DR_21 wikiPageUsesTemplate Template:Commons_category-inline.
- DR_21 wikiPageUsesTemplate Template:Convert.
- DR_21 wikiPageUsesTemplate Template:DEC.
- DR_21 wikiPageUsesTemplate Template:Infobox_nebula.
- DR_21 wikiPageUsesTemplate Template:RA.
- DR_21 wikiPageUsesTemplate Template:Reflist.
- DR_21 wikiPageUsesTemplate Template:Solar_mass.
- DR_21 subject Category:Cygnus_(constellation).
- DR_21 subject Category:Emission_nebulae.
- DR_21 subject Category:Molecular_clouds.
- DR_21 hypernym Cloud.
- DR_21 type Company.
- DR_21 comment "DR 21 is a huge molecular cloud located in the constellation Cygnus. This cloud is located about 6,000 light-years (1,800 pc) from Earth and extends for 80 light-years (25 pc). The region contains a high rate of star formation and is associated with the Cygnus X star forming region.".
- DR_21 label "DR 21".
- DR_21 sameAs Q5098469.
- DR_21 sameAs Category:DR_21.
- DR_21 sameAs DR_21.
- DR_21 sameAs m.0j3h1sf.
- DR_21 sameAs Q5098469.
- DR_21 wasDerivedFrom DR_21?oldid=696728110.
- DR_21 depiction Stars_in_the_DR21_Region.jpg_(crop).jpg.
- DR_21 isPrimaryTopicOf DR_21.