Agalaxy that has an unidentified shape is best classified as a(n)

Irregular galaxy

A galaxy that has an unidentified shape is best classified as an irregular galaxy.

An irregular galaxy is a galaxy that has an undefined regular shape. These galaxies are composed of large amounts of young stars, gas, and dust. Irregular galaxies are usually small, disorderly in appearance, and without a nuclear bulge or any trace of spiral arm shape. Examples of irregular galaxies are the small and large magellanic clouds.

The correct answer for this question is that a statement that can be proven by observation or measurement is known as a fact. The other possible answers here simply refer to idea that different individuals can place value on, but that are not necessarily known to be true.