Question

the color and temperature of stars are closely related. which color star is the hottest? black red yellow blue

Explanation:

Stars emit light due to their high - temperature. The color of a star is related to its surface temperature. According to Wien's displacement law, the wavelength of the peak of the black - body radiation curve is inversely proportional to the temperature ($\lambda_{max}T = b$, where $b$ is Wien's displacement constant). Blue light has a shorter wavelength than red and yellow light. A hotter star will emit more energy at shorter wavelengths. Black is not the color of a star's visible light emission (stars are not black - body radiators that emit only in the non - visible range in terms of their main visible color).

Answer:

blue