I will confine this brief review to just two examples of galaxies that seem to have interacted recently with impressive consequences: (1) the well-known Messier 51 system NGC 5194/5 = deservedly VV 1, and (2) the so-called Cartwheel, a ring within a ring, separated by vaguely spokelike features and accompanied by two smaller galaxies.
CITATION STYLE
Toomre, A. (1978). Interacting Systems. Symposium - International Astronomical Union, 79, 109–116. https://doi.org/10.1017/s0074180900144377
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