I thought it was pretty cool how way back in 1966 they could have pictures which pretty clearly told the story of how these things interact with each other. But at the same time, it's "just" a photo. It's interesting how in our age of digital feedback to think of how scientists of old could have still made all kinds of precise measurements with a relatively blurry photo.
Taken from the ATLAS OF PECULIAR GALAXIES from the Mount Wilson and Palomar Observatories at the California Institute of Technology.
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