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Kristen C. Dage et al 2023 ApJL 957 L17
The globular cluster that houses a repeating fast radio burst may have a moderately high stellar encounter rate, which allows the possibility that the burst source formed dynamically but does not rule out other possibilities.

Ludwig M. Böss et al 2023 ApJL 957 L16
When an infalling galaxy meets an outward-moving shock wave, it can invert the typical arc-like shape of a radio relic and create a “wrong way” relic instead.
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