How many constellations are there in the universe?

1922, the General Assembly of the International Astronomical Union decided to divide the sky into 88 constellations, and their names basically followed the historical names. 1928, the international astronomical union officially announced the names of 88 constellations. These 88 constellations are divided into three celestial regions, 29 in the northern hemisphere and 47 in the southern hemisphere, near the ecliptic 12.

And the constellation we usually say is the 12 constellation on the ecliptic. Each of them has some myths and legends about himself.

But for the universe, humans have only observed the Milky Way at present, and there are too many galaxies outside the river.