You could use 'select-keys' to filter the hashmaps;
(defn submap?
[m1 m2]
(= m1 (select-keys m2 (keys m1))))
(filter (partial submap? {:quad-col 0 :quad-row 0}) test-galaxy)
(filter (partial submap? {:sec-row 4 :sec-col 4}) test-galaxy)
(filter (partial submap? {:type :star}) test-galaxy)
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