Main Sequence Star Lives

A main sequence star fuses hydrogen nuclei into helium nucleus in its core. This process releases a lot of energy, which is why stars shine brightly.

Because stars can be of different sizes and temperatures, the amount of energy they produce varies.

Based on their temperatures, stars are classified into the following classes: O, B, A, F, G, K, and M.

O-class stars are blue and incredibly hot, with surface temperatures over 30000 K, while B-class stars are blue-white, with temperatures between 10000 and 30000 K.

Next, we have A-class stars, which are white and have temperatures between 7500 and 10000 K, and yellowish-white F-class stars, which have temperatures between 6000 and 7500 K.

G-class stars, like the Sun, are yellow with temperatures between 5000 and 6000 K.

At the cooler end, we have orange-colored K-class stars with temperatures from 3500 to 5000 K and red-colored M-class stars with temperatures from 2000 to 3500 K.

Most of the stars we see in the night sky are these main-sequence stars.