18, vocabulary knowledge: Ursa Major and Ursa Minor.

Ursa major is a well-known and important constellation in many cultures. As one of the oldest constellations in the sky, many stories and legends around the world associate it with bears.

In many cultures in the world, Ursa major is an important and famous constellation and one of the oldest constellations. Many legends and stories about this constellation are related to "bears".

In Latin, Ursa major means "bigger mother bear". In Greek, Arktos means "bear". Therefore, it is named the North Pole, which means bear, and describes the northernmost part of the earth. The constellation Ursa Major rules the sky.

In Latin, the constellation Ursa major means "Ursa major". In Greek, "bear" means Arktos. Because of this, the word "North Pole" can mean both "bear-like" and "North Pole of the earth". There, the constellation Ursa major dominates the sky.

As a very large constellation, Ursa major is also famous for its famous astrology or constellation combination, the Big Dipper.

As a big constellation, Ursa major contains a famous constellation, commonly known as the "Big Dipper".

Ursa minor means "little bear" in Latin, but this round polar constellation is more like the Big Dipper than a bear, so it is often called Little Big Dipper.

Although Ursa minor means "Little Bear" in Latin, this arched constellation looks more like a small bucket, hence the name "Little Big Dipper".

It is more unstable than the Big Dipper, but it contains the most important navigation star in our sky, Polaris, North Pole or Polaris.

Comparatively speaking, it is not as easy to identify as the Big Dipper, but it has a heavyweight member: Polaris, the brightest navigation star in the sky.