A group of stars in the sky that can be viewed from the Earth is known as a constellation. There are 88 known constellations that exist in the sky.
In addition to groups of stars or constellations, there are families of constellations. Families have characteristics that are similar to one another from the view on Earth or have some other common characteristic. Some examples of these families include the Ursa Major, the Heavenly Waters and the Orion family. The brightest constellation is the Crux or Southern Cross. The largest constellation is the Hydra. It covers approximately three percent of the total sky.