Editing Ursa Major (section)

===Deep-sky objects===
[[File:M101 hires STScI-PRC2006-10a.jpg|thumb|right|250px|The Pinwheel Galaxy]]
Several bright [[galaxies]] are found in Ursa Major, including the pair [[Messier 81]] (one of the brightest galaxies in the sky) and [[Messier 82]] above the bear's head, and [[Pinwheel Galaxy]] (M101), a spiral northeast of [[Alkaid]]. The spiral galaxies [[Messier 108]] and [[Messier 109]] are also found in this constellation. The bright [[planetary nebula]] [[Owl Nebula]] (M97) can be found along the bottom of the bowl of the Big Dipper.

[[Messier 81|M81]] is a nearly face-on [[spiral galaxy]] 11.8&nbsp;million light-years from Earth. Like most spiral galaxies, it has a core made up of old stars, with arms filled with young stars and [[nebula]]e. Along with [[Messier 82|M82]], it is a part of the [[galaxy cluster]] closest to the [[Local Group]].

[[Messier 82|M82]] is a nearly edgewise galaxy that is [[galaxy merger|interacting gravitationally]] with M81. It is the brightest [[infrared spectrum|infrared galaxy]] in the sky.<ref name="objects">{{cite book |title = 300 Astronomical Objects: A Visual Reference to the Universe |last1=Wilkins |first1=Jamie |last2=Dunn |first2 = Robert |publisher = Firefly Books |date = 2006 |edition = 1st |location=Buffalo, New York |isbn = 978-1-55407-175-3}}</ref> [[SN 2014J]], an apparent [[Type Ia supernova]], was observed in M82 on 21 January 2014.<ref>{{cite journal|bibcode=2014ATel.5786....1C|title=Classification of Supernova in M82 as a young, reddened Type Ia Supernova|journal=The Astronomer's Telegram|volume=5786|pages=1|last1=Cao|first1=Y|last2=Kasliwal|first2=M. M|last3=McKay|first3=A|last4=Bradley|first4=A|year=2014}}</ref>

[[Messier 97|M97]], also called the Owl Nebula, is a [[planetary nebula]] 1,630 light-years from Earth; it has a magnitude of approximately 10. It was discovered in 1781 by [[Pierre Méchain]].{{sfn|Levy|2005|pp=129–130}}

[[Messier 101|M101]], also called the Pinwheel Galaxy, is a face-on spiral galaxy located 25 million light-years from Earth. It was discovered by Pierre Méchain in 1781. Its spiral arms have regions with extensive [[star formation]] and have strong [[ultraviolet|ultraviolet emissions]].<ref name="objects"/> It has an [[integrated magnitude]] of 7.5, making it visible in both binoculars and telescopes, but not to the naked eye.<ref>{{cite journal |title = M101: A Bear of a Galaxy |last = Seronik |first = Gary |journal = Sky & Telescope |date = July 2012 |volume = 124 |issue = 1|page = 45 |bibcode = 2012S&T...124a..45S }}</ref>

[[NGC 2787]] is a [[lenticular galaxy]] at a distance of 24 million light-years. Unlike most lenticular galaxies, NGC 2787 has a [[barred spiral galaxy|bar]] at its center. It also has a halo of [[globular cluster]]s, indicating its age and relative stability.<ref name="objects"/>

[[NGC 2950]] is a lenticular galaxy located 60 million light-years from Earth.

[[NGC 3000]] is a double star, and catalogued as a nebula-type object.

[[NGC 3079]] is a [[starburst galaxy|starburst]] spiral galaxy located 52 million light-years from Earth. It has a horseshoe-shaped structure at its center that indicates the presence of a [[supermassive black hole]]. The structure itself is formed by [[superwind]]s from the black hole.<ref name="objects"/>

[[NGC 3310]] is another starburst spiral galaxy located 50 million light-years from Earth. Its bright white color is caused by its higher than usual rate of star formation, which began 100&nbsp;million years ago after a merger. Studies of this and other starburst galaxies have shown that their starburst phase can last for hundreds of millions of years, far longer than was previously assumed.<ref name="objects"/>

[[NGC 4013]] is an edge-on spiral galaxy located 55 million light-years from Earth. It has a prominent [[dust lane]] and has several visible star forming regions.<ref name="objects"/>

[[I Zwicky 18]] is a young dwarf galaxy at a distance of 45 million light-years. The youngest-known galaxy in the visible universe, I&nbsp;Zwicky 18 is about 4&nbsp;million years old, about one-thousandth the age of the [[Solar System]]. It is filled with star forming regions which are creating many hot, young, blue stars at a very high rate.<ref name="objects"/>

The [[Hubble Deep Field]] is located to the northeast of [[Delta Ursae Majoris|δ Ursae Majoris]].