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The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years from Earth in the Andromeda constellation. Also known as Messier 31, M31, or NGC 224, it is often referred to as the Great Andromeda Nebula in older texts. (Wikipedia)
Distance to Earth: 2,538,000 light years
Age: 9 billion years
Magnitude: 3.44
Stars: 1 trillion
Constellation: Andromeda
Apparent mass: ~1,230 billion M☉