Talk:NGC 1275

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[edit] Collision question

If the Universe is expanding and each star moves away from each other, then how come that two galaxy collide? --195.228.39.215 14:06, 28 June 2007 (UTC)

Gravitationally bound systems will not move away from each other as the universe expands. Hence, galaxies that are close enough to each other will stop moving away from each other with the expansion of th universe and will collide. Dr. Submillimeter 14:28, 28 June 2007 (UTC)

Thank you very much, Dr. Submillimeter! I forgot about the gravity... :-) --195.228.39.215 14:52, 28 June 2007 (UTC)