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Some TMNT stuff really isn't for little kids.

Hirobyl's star is the star thar Hirobyl orbits, deep within Dimension X. It is a red giant, seen in the Teenage Mutant Ninja Turtles Adventures issue The Lost World.

Once morning arrives Michelangelo notices the star being red, while Cherubae explains it's because its much older than the Sun, which indicates the star was once a yellow dwarf star, just like the Sun and has went through the same phase scientists believe the Sun will undergo in the distant future.