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David A. Edwards writes:
>In this case, as you can see from the M51 images, they are physically
>connected by a trail of stars.  These two galaxies are so close they are
>messing each other up, gravitationally.

Hummm, maybe it's my eyes but I'm not sure I can see the attaraction here. I see the trail, but not sure that they are gravitaionally atracted. If they were gravitationally attracted wouldn't M51 take material from the south and east as well as the north?

Jon