As we reported in our occasional e-newsletter, the recent discovery of dozens of previously unknown black holes has stargazers wondering: What’s the collective noun for a cluster of black holes? Our readers obliged with some clever suggestions, including a baffle of black holes, a sink of black holes, a density of black holes, a vacancy of black holes, and perhaps most poignantly, a loneliness of black holes. Maybe just the internet?

This is part of a complete episode.

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