Facts about Andromeda Constellation
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Andromedae, the second brightest star in the constellation after Alpheratz, lies approximately 200 light-years from Earth and belongs to the orange giant classification.
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Fifteen stars comprise the main asterism of the Andromeda Constellation, with Mirach and Almach serving as secondary bright markers after Alpheratz in defining its recognizable pattern.
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Visible to the naked eye from Earth's Northern Hemisphere, the Andromeda Constellation spans approximately 72 square degrees of sky, making it one of the largest constellations in the celestial sphere.
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Greek mythology named this constellation after the princess Andromeda, daughter of Cepheus and Cassiopeia, who was chained to a rock as sacrifice to a sea monster.
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About 2.2 million years ago, the Andromeda Constellation's brightest galaxy began its gravitational merger with the Milky Way, destined to collide completely in roughly 4.5 billion years.
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In 1612, astronomer Simon Marius first observed Messier 31 through a telescope and named it the Andromeda Nebula, believing it was a nebulous star cloud rather than a separate galaxy.
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Galaxies within the Andromeda Constellation include Messier 31, located approximately 2.5 million light-years from Earth and containing roughly one trillion stars.
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The brightest star in the Andromeda Constellation is Alpheratz, which shines at magnitude 2.06 and marks the northeastern corner of this celestial formation.