According to Hubble, the color of stars can tell us whether the stars are true - that is, just because you see a red star doesn't mean that it's old!.
[/caption] Look up into the sky and you'll see the stars twinkling in different colors. Some are dull and red, while others are white and others look.
Stars are hard to study because, apart from the Sun, they are so far away that they appear as nothing more than geometric points of light.
Astronomers have long used stars' color to identify their temperature, and they created a classification system called spectral classes to do so.
Although you can spot many colors of stars in the night sky, purple and green stars aren't seen because of the way humans perceive visible.
The stars show a multitude of colors, including red, orange, yellow, white, and blue. As we have seen, stars are not all the same color because they do not all.