Sky Watch: Hydra, the Celestial Water Snake
Here's a trivia question: Which is the largest of all constellations? If you answered "Hydra," you know more about the night sky than you admit.
At this time of year we can find Hydra, the water snake, low in the southern sky shortly after dark, winding a quarter of the way across the heavens. With a total length of about 100 degrees, this constellation encompasses 1,303 square degrees of...