Question

The change in colour of stars arises due to ________________________.

• A. variation in their distance from the earth
• B. variation in their surface temperature
• C. fluctuations in their composition and size
• D. irregular absorption or scattering in earth's atmosphere

Answer 1

The correct option is B variation in their surface temperature

The change of colour in stars is due to its composition and surface temperature. Stars surface mainly contains helium and hydrogen and many other elements. These elements burns to emit different electromagnetic wavelengths $\left(variationintemperature\right)$. These different wavelengths gives different colours of stars. Like when a star is hotter it gives out blue colour and when it is old, it shows red colour.

The correct answer is option B