The colours of stars depend on their A. Temperature B. Distance C. Radius D. Atmospheric pressure

The correct answer is A. Temperature.

The color of a star is determined by its surface temperature. The hotter the star, the bluer it appears. The cooler the star, the redder it appears.

The distance of a star does not affect its color. The radius of a star does not affect its color. Atmospheric pressure does not affect the color of a star.

The following is a brief explanation of each option:

• Temperature: The hotter the star, the bluer it appears. The cooler the star, the redder it appears. This is because the hotter the star, the shorter the wavelength of light it emits. The shorter the wavelength, the bluer the light.
• Distance: The distance of a star does not affect its color. This is because the color of light does not change as it travels through space.
• Radius: The radius of a star does not affect its color. This is because the color of light is determined by the temperature of the
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  star’s surface, not its radius.
• Atmospheric pressure: Atmospheric pressure does not affect the color of a star. This is because the light from a star is not affected by the atmosphere of the Earth.