Galaxies

Astronomers classify galaxies in three main categories – elliptical, spiral and irregular – with spiral and elliptical galaxies being those most observed to date. Both types of galaxy possess halos extending beyond their visible portions and both are thought to contain a supermassive black hole at their centre. Beyond shape, spiral and elliptical galaxies differ … Read more

Galaxies are categorized using the Hubble Classification, which includes elliptical and spiral shaped galaxies. Any galaxy that does not fit into either an elliptical or spiral shape is categorized as irregular. So an irregular galaxy is one that does not have a discernible shape. But there is much more to understanding them than just this. … Read more