COLORED STARS
Reading edition
Many of the double stars exhibit curious and beautiful phenomena of complementary colors. In such cases, the larger star is usually more or less reddish or orange, and the smaller one bluish-green or greenish-blue. Many of the double stars, on the contrary, are of the same color. There are white, red, blue, orange, green and yellow stars. The planets also vary greatly in color—Venus, e.g., being white, Mars reddish, etc. Inasmuch as the planets only reflect light, however, this is due to quite different causes; the other colored stars are self-luminous suns which emit light of their own.