The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
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In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
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Hydra is the largest of the 88 constellations, measuring 1303 square degrees.
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A star is a luminous sphere of plasma held together by its own gravity.
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