Radio images suggest a link between Betelgeuse’s changing outline and its companion’s expected orbit, offering clues to how a smaller star may influence a giant’s later life. Betelgeuse, the bright red supergiant marking Orion’s shoulder, may have another star stirring its atmosphere from within. Its recently identified companion, Siwarha, is thought to orbit at a distance of only about twice the giant’s radius. New radio observations suggest that this close neighbor is leaving a visible mark on the shape of Betelgeuse’s outer gas, even though the companion itself is too faint to appear in those observations. Researchers proposed Siwarha’s existence...