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FEELING THE PULL To the casual observer, this pair of galaxies appears completely separate, yet these far-flung entities are in the very early stages of collision. They are already affecting each other’s gravitational field. The unfurling of the left galaxy’s outer spiral arm gives a hint of this early interaction. Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration, A. Evans (Univ. of Virginia, Charlottesville/NRAO/Stony Brook University)

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