左边，以红色气体和尘埃云为标志的，是不规则星系m 82。

On the left, marked by red gas and dust clouds, is irregular galaxy M82.

youdao

星系主要分为三类：螺旋星系、椭圆星系和不规则星系。

Galaxies are classified into three main types: spiral galaxies, elliptical galaxies, and irregular galaxies.

youdao

NGC 1427a是个典型的矮星系、不规则星系，它们的外形不规则，并且光度比规则星系(涡旋星系、椭圆星系)小。

NGC 1427a is an example of a dwarf irregular galaxy, a type of galaxy that is significantly less bright than regular galaxies and characterised by a peculiar shape.

youdao