For stars, there is a relationship between the color, temperature, size, and chemical composition. You may have heard the Sun called a type G2V star, or that the members of the Pleiades (M45) are ...

The brightness of a star depends on its surface temperature and size. Color. Stars come in a range of colors, from reddish to yellowish to blue. The color of a star depends on surface temperature.

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.

A star’s color is a sign of its evolutionary stage (SN: 7/23/21). When stars burn through the hydrogen fuel in their cores, they puff up and expel gases into space.