Stellar2026-03-172 minarXiv:2603.17001expressAn Old Star Puts the Brakes Back On31 Aquilae is an aging star that has puffed up into a subgiant. It once resembled the Sun, but has since cooled and grown larger. It rotates very slowly — one full turn takes many days.Travis S. Metcalfe·Jennifer L. van Saders·Thomas R. Ayres·Derek Buzasi·Jeremy J. Drake·Ricky Egeland·Rafael A. Garcia·Oleg Kochukhov·Steven H. Saar·Keivan G. Stassun·Sarbani Basu·J. M. Joel Ong·Amalie Stokholm·Timothy R. Bedding·Sylvain N. Breton·Ilya V. Ilyin·Pascal Petit·Marc H. Pinsonneault·Klaus G. StrassmeierSubrahmanyan ChandrasekharBohdan PaczyńskiFritz Zwickybinary starwhite dwarf👍👎☆SimplePopularAdvanced