The Secrets of 2MASSThe Secrets of 2MASSJ05215658+4359220hidden companion's nature.Investigating a red giant and itsSolar and Stellar AstrophysicsExploring the Binary Star System 2MASS J05215658+4359220A red giant star's hidden companion raises questions about stellar evolution.2025-06-11T05:28:48+00:00 ― 7 min read