Hey to the sort by new x

SELECT * FROM gallery2 WHERE topic_id="46566" UNION SELECT * FROM gallery2 WHERE topic_id="822448" UNION SELECT * FROM gallery2 WHERE topic_id="1093821" UNION SELECT * FROM gallery2 WHERE topic_id="997495" UNION SELECT * FROM gallery2 WHERE topic_id="1437449" UNION SELECT * FROM gallery2 WHERE topic_id="63294" UNION SELECT * FROM gallery2 WHERE topic_id="7322" UNION SELECT * FROM gallery2 WHERE topic_id="1224039" UNION SELECT * FROM gallery2 WHERE topic_id="1531689" UNION SELECT * FROM gallery2 WHERE topic_id="1442313" UNION SELECT * FROM gallery2 WHERE topic_id="1062942" UNION SELECT * FROM gallery2 WHERE topic_id="927454" UNION SELECT * FROM gallery2 WHERE topic_id="905772" UNION SELECT * FROM gallery2 WHERE topic_id="192220" UNION SELECT * FROM gallery2 WHERE topic_id="689884" UNION SELECT * FROM gallery2 WHERE topic_id="1679871"