The size of a constellation such as Hydra (The Water Monster) is measured in square degrees and it is 1302.844 sq. degrees in size. It takes up 3.16% of the night sky. It is the 1st largest constellation in the night sky.
It has 121 stars that have an apparent magnitude of 6.5 or lower. 6.5 is the faintest a star can be before it is no longer viewable with the naked eye. Of those bright stars, only 21 stars make up the constellation pattern.
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