Editing Aries (constellation) (section)

==== Deep sky objects ====
[[File:NGC772 SN2003hl SN2003iq 6223 Dahl.jpg|thumb|right|NGC 772, with a notated [[supernova]]]]
[[NGC 772]] is a [[spiral galaxy]] with an [[integrated magnitude]] of 10.3, located southeast of β Arietis and 15 arcminutes west of [[15 Arietis]].{{sfn|Moore|Tirion|1997|pp=128–129}} It is a relatively bright galaxy and shows obvious nebulosity and ellipticity in an amateur telescope. It is 7.2 by 4.2 arcminutes, meaning that its [[surface brightness]], magnitude 13.6, is significantly lower than its integrated magnitude. NGC 772 is a [[galaxy morphological classification|class SA(s)b galaxy]], which means that it is an unbarred spiral galaxy without a ring that possesses a somewhat prominent [[bulge (astronomy)|bulge]] and spiral arms that are wound somewhat tightly.{{sfn|Thompson|Thompson|2007|pp=90–91}} The main arm, on the northwest side of the galaxy,{{sfn|Burnham|1978|pp=245–252}} is home to many [[star formation|star forming regions]]; this is due to previous [[galaxy merger|gravitational interactions]] with other galaxies. NGC 772 has a small companion galaxy, [[NGC 770]], that is about 113,000 light-years away from the larger galaxy. The two galaxies together are also classified as Arp 78 in the [[Arp number|Arp peculiar galaxy catalog]]. NGC 772 has a diameter of 240,000 light-years and the system is 114 million light-years from Earth.{{sfn|Bratton|2011|pp=63–66}} Another spiral galaxy in Aries is [[NGC 673]], a face-on class SAB(s)c galaxy. It is a weakly [[barred spiral galaxy]] with loosely wound arms. It has no ring and a faint bulge and is 2.5 by 1.9 arcminutes. It has two primary arms with fragments located farther from the core. 171,000 light-years in diameter, NGC 673 is 235 million light-years from Earth.{{sfn|Bratton|2011|pp=63–66}}

[[NGC 678]] and [[NGC 680]] are a pair of galaxies in Aries that are only about 200,000 light-years apart. Part of the [[NGC 691]] group of galaxies, both are at a distance of approximately 130 million light-years. NGC 678 is an edge-on spiral galaxy that is 4.5 by 0.8 arcminutes. NGC 680, an [[elliptical galaxy]] with an asymmetrical boundary, is the brighter of the two at magnitude 12.9; NGC 678 has a magnitude of 13.35. Both galaxies have bright cores, but NGC 678 is the larger galaxy at a diameter of 171,000 light-years; NGC 680 has a diameter of 72,000 light-years. NGC 678 is further distinguished by its prominent [[dust lane]]. NGC 691 itself is a spiral galaxy slightly inclined to our line of sight. It has multiple spiral arms and a bright core. Because it is so diffuse, it has a low surface brightness. It has a diameter of 126,000 light-years and is 124 million light-years away.{{sfn|Bratton|2011|pp=63–66}} [[NGC 877]] is the brightest member of an 8-galaxy group that also includes NGC 870, NGC 871, and NGC 876, with a magnitude of 12.53. It is 2.4 by 1.8 arcminutes and is 178 million light-years away with a diameter of 124,000 light-years. Its companion is NGC 876, which is about 103,000 light-years from the core of NGC 877. They are interacting gravitationally, as they are connected by a faint stream of gas and dust.{{sfn|Bratton|2011|pp=63–66}} [[Arp 276]] is a different pair of interacting galaxies in Aries, consisting of NGC 935 and IC 1801.{{sfn|SIMBAD Arp 276}}

NGC 821 is an E6 elliptical galaxy. It is unusual because it has hints of an early spiral structure, which is normally only found in [[lenticular galaxy|lenticular]] and spiral galaxies. NGC 821 is 2.6 by 2.0 arcminutes and has a visual magnitude of 11.3. Its diameter is 61,000 light-years and it is 80 million light-years away.{{sfn|Bratton|2011|pp=63–66}} Another unusual galaxy in Aries is [[Segue 2]], a [[dwarf galaxy|dwarf]] and [[List of Milky Way's satellite galaxies|satellite galaxy of the Milky Way]], recently discovered to be a potential relic of the [[epoch of reionization]].{{sfn|Belokurov et al.|2009}}