Here's why:

* Constellations are patterns: Constellations are groups of stars that humans have imagined to form shapes in the night sky.

* No official boundaries: There are no hard, physical boundaries defining a constellation.

* Stars at different distances: The stars in a constellation are not all at the same distance from Earth. Some are much farther away than others.

* Star counts vary: Astronomers have identified many stars in the area of the sky where Taurus is, but depending on the brightness threshold used, the number can vary greatly.

What we can say: Taurus is a prominent constellation with several bright stars, including Aldebaran (its brightest star), the Pleiades star cluster, and the Hyades star cluster.