- Irregular galaxies appear chaotic in the night sky without symmetry.
- Average size of a irregular galaxiy is 20,000 light years.
- The average age of a spiral galaxy is between 10 and 13.6 billion years old.
- Dwarf irregular galaxies are a type of irregular galaxy that is small and dull.
- Messier 82 is visible in the Cigar Galaxy which is visible in the northern hemisphere.