The galaxy meme format grew out of the expanding brain meme, where each panel shows a brain glowing brighter as an idea supposedly gets smarter, ending in a full cosmic galaxy state. This louder, bass boosted edit became a shortcut for that final stage on TikTok, YouTube Shorts and meme edits, pairing the image or a slow zoom with an exaggerated swell. It stays popular because the joke is instant, even without the original panels, the rising sound alone signals a mock profound, supposedly genius conclusion.