-written by Sahil
We all must have noticed at least once while looking at the spectacular stars on a clear night, that all the stars are different from one another. While our eyes get caught on the brightest stars, we also see that their colors vary, some are too dim and some twinkle a bit too much. Let us see why these stars appear to be so different from each other.
The brightness of a star depends on the amount of energy it exerts, and its distance from the earth. The stars vary in temperature too, which justifies the variation in the colors. Hotter stars appear to be blue or white, while cooler stars appear to be orange or red. The stars are characterized by their color and temperature. The sequence ranges from the largest and hottest to the smallest and coolest.
Only Boring Astronomers Feel Geeks Know More. It’s always fun to remember things with mnemonics, isn’t it? This is the sequence of the seven main types of stars. O (blue), B (blue-white), A (white), F (yellow-white), G (yellow), K (orange) and M (red). The extended sequence includes supergiants, red giants, and white dwarfs. These are the dying stars. It is fascinating to know that unlike what we would expect, Larger stars have shorter lifespans and the smaller stars have much longer lifespans. This is because the larger stars burn out their nuclear fuel quicker.
Let us now talk about different types of stars in their various phases of the lifecycle.