The Pinwheel Galaxy is a large galaxy in the constellation of Ursa Major, with a diameter of 170 000 light-years and around trillion stars it is almost twice as large as the Milky Way. This galaxy also has a high population of H II regions - many of which are large and bright. They are ionized by newly formed stars in them, these regions are known to collapse under their own gravitational force causing more star formation in these superbubbles. Three of these regions were prominent enough to receive New General Catalogue numbers 5461, 5462 and 5471.
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