Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  A SpaceX Super Heavy rocket booster as tall as a 20-story building reappeared in the skies over South Texas minutes after blastoff in October, blazing up its engines to slow its fall back toward Earth. In an unprecedented feat , the booster wowed audiences with a precision midair landing in the arms of its launch tower. The stunning spectacle —