GalaxiasGalaxia em Cauda Anelada formada pela interacao entre duas galaxias acontece a partir da acao interna de seus campos gravitacionais. Possivelmente, as duas galaxias chegaram tao proximas uma a outra que muitas de suas estrelas e ainda uma grande quantidade de material interestelar, sairam de suas orbitas originais e mergulharam no espaco galactico. Isso deve explicar os filamentos alongados e curvados que se extendem de norte a sul a partir das duas galaxias. Este objeto celeste esta a cerca de 90 milhoes de anos-luz e o diametro real do par e cerca de 100 mil anos-luz. Uma formacao similar existe na constelacao de Cancer. 6a. Edicao do Atlas Celestede autoria de Ronaldo Rogerio de Freitas Mourao,Editora Vozes, Petropolis, ano de 1986The Night Sky Atlashttp://www.nightskyatlas.com/ngcData.jsp?id=CRVRevisedNGCNumberRAhoursJ2000DECdegreesJ2000MajorDiameterarcminsMinorDiameterarcminsPositionAngledegreesVisualMagnitudeSurfaceBrightnessmag/arcmin2ObjectTypeTypeCodesNGC 403812h 01m 52.8s-18 51 52"3.4 1.7 9410.312.1barred spiral galaxy1 SBmNGC 403912h 01m 53.8s-18 53 08"3.3 1.7 5510.412.1https://en.wikipedia.org/wiki/Antennae_GalaxiesThe Antennae Galaxies, also known as NGC 4038/NGC 4039, are a pair of interacting galaxies in the constellation Corvus. They are currently going through a starburst phase, in which the collision of clouds of gas and dust, with entangled magnetic fields, causes rapid star formation. They were discovered by William Herschel in 1785.[3] NGC 4038 is located at RA 12h 01m 53.0s, Dec 18 52 10; and NGC 4039 at RA 12h 01m 53.6s, Dec 18 53 11.General informationGround-based telescopic view of the Antennae Galaxies.The Antennae Galaxies are undergoing a galactic collision. Located in the NGC 4038 group with five other galaxies, these two galaxies are known as the Antennae Galaxies because the two long tails of stars, gas and dust ejected from the galaxies as a result of the collision resemble an insect's antennae. The nuclei of the two galaxies are joining to become one giant galaxy. Most galaxies probably undergo at least one significant collision in their lifetimes. This is likely the future of our Milky Way when it collides with the Andromeda Galaxy.Five supernovae have been discovered in NGC 4038: SN 1921A, SN 1974E, SN 2004GT, SN 2007sr and SN 2013dk.[4]A recent study finds that these interacting galaxies are less remote from the Milky Way than previously thoughtat 45 million light-years instead of 65 million light-years.[5]They are located 0.25 north of 31 Crateris and 3.25 southwest of Gamma Corvi.[6]The Antennae galaxies also contain a relatively young collection of massive globular clusters that were possibly formed as a result of the collision between the two galaxies. [7] The young age of these clusters is in contrast to the average age of most known globular clusters, around 12 billion years old, with the formation of the globulars likely originating from shockwaves, generated by the collision of the galaxies, compressing large, massive molecular clouds. The densest regions of the collapsing and compressing clouds are believed to be the birthplace of the clusters.TimelineAbout 1.2 billion years ago, the Antennae were two separate galaxies. NGC 4038 was a barred spiral galaxy and NGC 4039 was a spiral galaxy. Before the galaxies collided, NGC 4039 was larger than NGC 4038.[citation needed] 900 million years ago, the Antennae began to approach one another, looking similar to