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The sensor blitz. The other answers are pretty good, but just for fun variety, when a ship arrives in a destination that they think is dangerous and might get attacked, they could launch cluster bombs that each contain thousands of micro-sensors, the size of a penny or whatever. They fill the entire surrounding space for thousands of miles with these, ...


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A micro-sized black hole will be a powerful source of intense gamma rays and interesting particle radiation; that's just the nature of Hawking radiation. A hole which evaporates in a second is emitting zettawatts of EM and particle radiation. A shorter-lived hole will be proportionally brighter, and even if it were travelling at highly relativistic speeds ...


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An object between an observer and a light source will affect light coming from the source. https://en.wikipedia.org/wiki/Kugelblitz_(astrophysics) In simpler terms, a kugelblitz is a black hole formed from radiation as opposed to matter. (Such a black hole would nonetheless have properties identical to one of equivalent mass and angular momentum ...


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