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hot spot
- A center of persistent volcanism, thought to be the surface expression of a rising hot plume in a planetary mantle (as seen, for example, on Earth and on Io).
• GEOLOGY AND PLANETARY SCIENCE - A small, bright region (also known as a bright spot) in a cataclysmic binary, located either where the matter stream collides with the outer edge of the accretion disk, or at the inner edge of the disk.
• STELLAR ASTROPHYSICS - A small, radio-bright region in a lobe of a radio galaxy, thought to be caused by high-speed material in a jet colliding with boundary between the lobe and the intergalactic medium.
• GALAXIES
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