polar ring galaxy

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A rare type of galaxy, almost always a lenticular galaxy, that has a luminous ring of stars, gas, and dust orbiting over the poles of its disk. Hence, the rotation axes of the ring and disk are almost at right angles. Such a system may be the result of a collision, tidal capture, or merger of a gas-rich galaxy with the lenticular galaxy.

Subjects: Astronomy and Astrophysics.

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