Well presumably anyone smart enough to mass produce interstellar probes would be able to make pretty decent sensors for a probe that's 100-1000 meters long (Oum

Well presumably anyone smart enough to mass produce interstellar probes would be able to make pretty decent sensors for a probe that's 100-1000 meters long (Oumuamua). Might even pick an asteroid that's long and thin and core it out and put a big telescope inside. At least some speculation on Oumuamua lead to the conclusion that it had unusually low mass for an object so large. Oumuamua might well have reported something interesting 1000 years ago when it was 0.09 light years away. Maybe changes in the atmospheric chemistry related to human activity. Also note C/2019 Q4 is approaching at about 50% faster than the previous. It looks like it's a comet with a tail... or is that a retrorocket?