The recent study you are referring to is a 2023 study published in the journal Nature Astronomy.

The study used data from the Hubble Space Telescope to 

study the shapes of galaxies in the nearby universe. 

The study found that 70% of galaxies are elliptical, 20% are spiral, and 10% are irregular. 

Spiral galaxies are the most common type of galaxy.  

They are characterized by a central bulge of stars surrounded by a disk of stars. 

The disk of stars is further subdivided into spiral arms.  

The spiral arms are regions of active star formation. 

This is because the spiral arms contain a lot of gas and dust, which are the raw materials for stars.