A galaxy that lacks a distinct, regular structure like spiral arms or an elliptical shape. These galaxies appear chaotic and asymmetrical, often containing active star-forming regions with bright, young stars.
From Latin 'irregularis' meaning 'not according to rule' and Greek 'galaxias' meaning 'milky circle.' The term emerged in the early 20th century when astronomers began classifying galaxies and realized some didn't fit the neat spiral or elliptical categories.
The Magellanic Clouds, our nearest galactic neighbors, are irregular galaxies that were actually shaped by their gravitational dance with the Milky Way! Many irregular galaxies are cosmic teenagers - they're often much younger than spiral galaxies and are still actively forming stars at a rapid pace.
Complete word intelligence in one call. Free tier — 50 lookups/day.