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How do we know that some galactic bodies have interacted with each other?
O A. Spallation caused particle exchange.
OB.
Some bodies appear inhabitable.
OC. Most orbits are elliptical in shape.
OD
Low confidence intervals are observed.
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If one of the colliding galaxies is much larger than the other, it will remain largely intact and retain its shape, while the smaller galaxy will be stripped apart and become part of the larger galaxy.
