What is galaxy harassment: Definition and 1 Discussions

Interacting galaxies (colliding galaxies) are galaxies whose gravitational fields result in a disturbance of one another. An example of a minor interaction is a satellite galaxy disturbing the primary galaxy's spiral arms. An example of a major interaction is a galactic collision, which may lead to a galaxy merger.

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  1. milkism

    I Retro/prograde flyby galaxies and their bar formation

    https://iopscience.iop.org/article/10.1088/2041-8205/790/2/L33/pdf In section 3, it states that during a 1:1 prograde passage, bar formations are visible in both galaxies, whereas in the retrograde version, there are no bar formations in either galaxy. I would like to understand the physics...
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