Which property is common to spiral galaxies? open clusters in the halo. globular clusters in the nucleus. on-going star formation and emission nebula in the arms very little internal structure. on-going star formation and emission nebula in the halo?

A common characteristic among the spiral galaxies is that globular clusters are usually located in the nucleus. By definition, a spiral galaxy is a type of galaxy wherein huge concentrations of cosmic cloud and gas are located in its spiral arms. Our very own Milky Way is a spiral galaxy itself, and the solar system is located at the Sagittarius Arm.