M82 is an irregular galaxy also known as NGC 3034. It is a member of the M81 galaxy group, as can be seen in the image below:
M82 is the ‘cigar’ shaped galaxy to the right, whilst M81 is the spiral to the left.
Click image for close up & details …
Its core has been deformed by a close shave with M81, this is seen as dark central banding & expulsion of gaseous matter from the centre. The galaxy is also an extremely bright source of both infra-red & radio waves.