Red Sun

Red suns are cool and giants stars that emit very little energy compared to a yellow sun. Due to their low output, very few worlds with life orbit a red star as few worlds are warm enough to support it. A red sun is also known to take away the powers of a Kryptonian or Daxamite should they end up on a world with a red sun even after being on one with a yellow sun.

Known Red Stars
Rao: Rao is the star that Krypton and Daxam orbited before their subsequent destruction.

Maaldoria's sun: The planet Maaldoria, known as Slaver's Moon, orbits a red star. When Kara Danvers and Mon-El visited this world to save kidnap victims, they both lost their yellow sun powered abilities.