For the next week or so sky-watchers in the Northern Hemisphere will have the chance to see an elusive celestial pyramid known as the zodiacal light. The triangular tower of light is easiest to spot around the spring and fall equinoxes. Look for it over the eastern horizon about an hour before sunrise in the fall, and over the western horizon just before sunset in the spring. Unlike the stars and gases of the Milky Way, which stretch away from Earth for light-years, the source of the zodiacal light lies between the inner planets of our solar system. The dusty disk, also called the zodiacal cloud, radiates from near the sun out beyond the orbit of Mars, toward Jupiter. The dust reflects and scatters sunlight in such a way that it creates a visible glow for observers on Earth.
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