Wonder what “something else” is

SELECT * FROM gallery2 WHERE topic_id="1137393" UNION SELECT * FROM gallery2 WHERE topic_id="1812316" UNION SELECT * FROM gallery2 WHERE topic_id="1577794" UNION SELECT * FROM gallery2 WHERE topic_id="216814" UNION SELECT * FROM gallery2 WHERE topic_id="1020346" UNION SELECT * FROM gallery2 WHERE topic_id="1509757" UNION SELECT * FROM gallery2 WHERE topic_id="1621977" UNION SELECT * FROM gallery2 WHERE topic_id="1652713" UNION SELECT * FROM gallery2 WHERE topic_id="983031" UNION SELECT * FROM gallery2 WHERE topic_id="1101144" UNION SELECT * FROM gallery2 WHERE topic_id="696848" UNION SELECT * FROM gallery2 WHERE topic_id="55164" UNION SELECT * FROM gallery2 WHERE topic_id="559300" UNION SELECT * FROM gallery2 WHERE topic_id="591962" UNION SELECT * FROM gallery2 WHERE topic_id="871307" UNION SELECT * FROM gallery2 WHERE topic_id="1512115"