However, stars are always producing more than one wavelength of light. Any star emitting mostly green will also be putting out lots of red and blue, making the star look white. Changing the star's ...

The team found that the star, located in the Orion constellation in the Milky Way around 640 light-years from Earth, changed from a yellow-orange color to red approximately 2,000 years ago.

The sky isn’t just blue — airglow makes it green, yellow, and red too The sky looks blue on a sunny day. But at night, we can see the faint glow of its true color.