Representative constellations of northern starry sky in winter _ Common constellations of northern starry sky in winter

There are several crowded stars in the northern winter night, which are very close to each other. They appeared in the sky around 9 pm. What constellation is it? Is it a nebula?

It is considered as the Pleiades, a combination of Taurus nebula and cluster, and the 45th celestial body in the messier catalog, namely M45.

If you look through a telescope, you can easily distinguish dozens of stars inside, and new stars are constantly forming in this area, but you must use a large-caliber telescope to see the nebula.