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Galaxies and Their Properties
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Andromeda
Type: Spiral, Approximate Size: 220,000 light-years in diameter, Distinctive Features: Nearest spiral galaxy to the Milky Way, expected to collide with our galaxy in about 4 billion years.
Whirlpool Galaxy (M51)
Type: Spiral, Approximate Size: 76,000 light-years in diameter, Distinctive Features: Known for its pronounced spiral structure, interacting with a smaller galaxy NGC 5195.
Magellanic Clouds
Type: Dwarf irregular, Approximate Size: Large Magellanic Cloud is about 14,000 light-years in diameter; Small Magellanic Cloud is about 7,000 light-years in diameter, Distinctive Features: Two irregular dwarf galaxies orbiting the Milky Way, important for studying the interstellar medium.
Pinwheel Galaxy (M101)
Type: Spiral, Approximate Size: 170,000 light-years in diameter, Distinctive Features: Has a relatively low surface brightness, making it a challenge to observe, but has well-defined spiral arms.
Milky Way
Type: Spiral, Approximate Size: 100,000–120,000 light-years in diameter, Distinctive Features: Contains our Solar System, has a supermassive black hole at its center named Sagittarius A*.
Sombrero Galaxy (M104)
Type: Spiral, Approximate Size: 50,000 light-years in diameter, Distinctive Features: Prominent dust lane in its lens-shaped structure, resembles a sombrero hat.
Messier 87 (M87)
Type: Elliptical, Approximate Size: 120,000 light-years in diameter, Distinctive Features: Contains a supermassive black hole known for producing a jet of particles, was the first to be imaged directly by the Event Horizon Telescope.
Triangulum Galaxy (M33)
Type: Spiral, Approximate Size: 60,000 light-years in diameter, Distinctive Features: Part of the Local Group, one of the galaxies that can be observed with the naked eye from Earth.
IC 1101
Type: Supergiant elliptical, Approximate Size: Up to 6 million light-years in diameter, Distinctive Features: Considered the largest known galaxy discovered to date, located in the center of the Abell 2029 galaxy cluster.
Centaurus A
Type: Lenticular galaxy, Approximate Size: 60,000 light-years in diameter, Distinctive Features: Notable for its massive central black hole and the jet it emits, very active radio source.
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