Question

What is meant by galaxies that are "interacting?"

Answer 1

Interacting galaxies (colliding galaxies) are galaxies whose gravitational fields result in a disturbance of one another. An example of a major interaction is a galactic collision, which may lead to a galaxy merger.

Answer 2

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An 'interacting galaxy' is one that is in the process of being affected by another galaxy. This is not an uncommon occurrence as galaxies are rarely found in isolation. Most are surrounded by a swarm of satellite galaxies and are themselves embedded in larger aggregates called groups or clusters.