In the summer night sky, the Milky Way is clearly visible.
General term for any galaxy, including the Milky Way. Often used in compounds like 銀河系 (galactic system) or 銀河団 (galaxy cluster).
この銀河は地球から約250万光年離れている。
This galaxy is about 2.5 million light-years away from Earth.
There are countless galaxies in this universe.
The astronomers are observing a distant galaxy.
It is said that two galaxies will collide in billions of years.
active galaxy
spiral galaxy