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Whirlpool Galaxy (M51, NGC 5194)
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| The Whirlpool Galaxy. Image courtesy Richard Crisp
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M51 is the first galaxy in which spiral structure was discovered, by Lord Rosse in 1845. This structure, however, has clearly been influenced by the gravitational effect of the companion, which has triggered a huge burst of star formation in the Whirlpool and has also distorted its arms.
M51 is the dominant member of a small group of galaxies that also includes the Sunflower Galaxy (M63) and half a dozen other smaller systems.
| Visual magnitude | 8.4 |
| Apparent size | 11' × 7' |
| Distance | 31 million light-years (9.5 Mpc) |
| Position | R.A. 13h 29.9m, Dec. +47° 12' |
Related categories
• GALAXIES
• MESSIER CATALOGUE
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