1 This discovery revolves around Red Supergiant stars named, KW Sagitarii, KY Cygni, V354 Cephei, and VV Cephei. A red supergiant star forms when a star enters in the last of stage of its lifetime, the hydrogen fusion stops, and the star expands its surface outwards. A star expands greatly during this stage, and this is going to happen to our sun 5 billion years ago. The study of these stars has allowed us to understand the fate of our sun. 2. The scientist team who has discovered this know this observationally and theoretically. They had studied the light emitted by these stars using powerful telescopes, the surface color and the wavelength of the emitted light tell us about the details about a star.