The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees.
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A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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