Facts about Pinwheel Galaxy

1. 07

   Intense star formation occurs within the Pinwheel Galaxy's spiral arms, where massive young stars produce brilliant blue light and ionized hydrogen gas creates distinctive reddish H-alpha emission regions.

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2. 06

   Hubble Space Telescope observations revealed that the Pinwheel Galaxy's disk contains younger, bluer stars in its spiral arms compared to the older, redder stars populating its central bulge.

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3. 05

   The Pinwheel Galaxy's outer regions rotate at unexpectedly high speeds, suggesting the presence of substantial dark matter halos surrounding this spiral system.

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4. 04

   Eleven spiral arms extend from the Pinwheel Galaxy's central region, a notably high number compared to the Milky Way's typical two to four main arms.

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5. 03

   During the 2011 supernova SN 2011fe, the Pinwheel Galaxy brightened considerably, allowing astronomers to refine distance measurements to this nearby spiral galaxy.

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6. 02

   M101, the Pinwheel Galaxy's official designation, contains an estimated one trillion stars distributed across its grand design spiral structure.

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7. 01

   Approximately 21 million light-years away, the Pinwheel Galaxy spans roughly 170,000 light-years across, making it nearly twice the diameter of the Milky Way.

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