Question

What are the colours of the stars from hottest to coldest?

Answer 1

Hint: The colours of the stars can be defined by their surface temperature. The higher the temperature of the stars, the brighter they will be. Even the stars will have higher luminosity. The nuclear reaction that takes place on their surface is the reason for their shine.

Complete answer:
The hotter (high temperature) the star the more brighter it will be. Even the luminosity of the stars increases with the increase in temperature.
The list of star types and their respective surface temperature is given as follows. The unit of the temperature is in Kelvin.

Star type	Surface temperature
O	30,000
B	20,000
A	10,000
F	7,000
G	6,000
K	4,000
M	3,000

The stars that belong to the star type O having a surface temperature of 30,000 K will be dark blue in colour. The stars that belong to the star type B having a surface temperature of 20,000 K will be blue in colour. The stars that belong to star type A having a surface temperature of 10,000 K will be white in colour. The stars that belong to the star type F having a surface temperature of 7,000 K will be light yellow in colour. The stars that belong to the star type G having the surface temperature of 6,000 K will be yellow in colour. The stars that belong to the star type K having a surface temperature of 4,000 K will be orange in colour. The stars that belong to the star type M having a surface temperature of 3,000 K will be red in colour.
$$\therefore$$The colours of the stars from hottest to coldest are dark blue, blue, white, light yellow, yellow, orange and red.

Note:
The stars that fall in the middle of the star types list, its colour is white, that is, the combination of all colours. For billions of years, the stars can shine but do not last forever. The stars shine because of the nuclear reaction that takes place on their surface.