What Is Ursa Major?
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Ursa Major (the Great Bear) is the third-largest of the 88 official constellations. It contains the famous Big Dipper asterism, which forms the bear's hindquarters and tail. Ursa Major is visible year-round from most of the Northern Hemisphere and has been recognized as a bear by many cultures across history.
Ursa Major is one of the oldest and most recognized constellations. The Latin name means Great Bear, and remarkably, many cultures around the world have independently associated this constellation with a bear, including Greek, Roman, and Native American traditions. The constellation contains the Big Dipper asterism that most people know it by, but Ursa Major is much larger and includes many additional stars beyond the seven famous ones.
How big is Ursa Major?
The third-largest constellation. According to NASA, the Big Dipper is the most recognizable feature within Ursa Major, the Great Bear. Ursa Major itself is the third-largest of the 88 constellations by area, behind only Hydra and Virgo. It contains many more stars than just the seven of the Big Dipper, including dozens visible to the naked eye and many more visible with binoculars or telescopes. The full bear figure includes the head, legs, and full body in addition to the dipper-shaped section.
What's the difference between Ursa Major and the Big Dipper?
Scale and definition. The Big Dipper is an asterism, a familiar star pattern that isn't officially a constellation. It's made of seven bright stars that form the hindquarters and tail of the Great Bear. Ursa Major is the official constellation containing the Big Dipper as one part of a larger figure. When most people point at the Big Dipper, they're pointing at part of Ursa Major. The full constellation contains additional stars representing the bear's head, legs, and forelimbs.
Why a bear?
Multiple cultures independently saw a bear. Greek mythology says Zeus transformed the nymph Callisto into a bear and placed her in the sky as Ursa Major. Roman, Babylonian, and several Native American cultures (including the Iroquois and Algonquin) also identified this group of stars as a bear, despite having no contact with each other. This convergence is unusual and may relate to a long, narrow shape that ancient observers thought looked like a bear (although bears generally don't have long tails). Some cultures interpreted it differently as a wagon, plow, or other shape.
When can you see it?
Year-round from most of the Northern Hemisphere. Ursa Major is circumpolar from latitudes above about 41° North (roughly New York City and farther north), meaning it never sets and is visible on any clear night. From mid-northern latitudes farther south, it's still visible most of the year. In spring, Ursa Major appears overhead and the Big Dipper looks like a dipper. In fall, it's lower in the north and the dipper appears upside-down. From the Southern Hemisphere, the constellation is hard or impossible to see.
Ursa Major (the Great Bear) is the third-largest of the 88 official constellations, containing the famous Big Dipper as one part of a larger figure. The constellation is visible year-round from most of the Northern Hemisphere and has been recognized as a bear by many cultures throughout history, including Greek, Roman, and several Native American traditions. The Big Dipper's pointer stars help observers find Polaris, the North Star.
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