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What Is Zodiacal Light?

A faint, diffuse, and roughly triangular glow observed in the night sky, extending upward from the horizon along the ecliptic (the plane of the Earth's orbit, roughly where the Zodiac constellations lie).

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What Is Zodiacal Light?

A faint, diffuse, and roughly triangular glow observed in the night sky, extending upward from the horizon along the ecliptic (the plane of the Earth's orbit, roughly where the Zodiac constellations lie).

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Cause

It is caused by sunlight being scattered towards the Earth by interplanetary dust particles, which are left over from comets and asteroids and orbit the Sun in the plane of the solar system.

Visibility

Best seen after sunset (in the west) or before sunrise (in the east) in the spring and autumn, respectively, under extremely dark, moonless skies.

Connection to Vision

While not a disease, it represents the absolute limit of light detection by the human scotopic (rod-mediated) visual system and is often called "false dawn" or "false dusk."

Is it part of the Milky Way?

No. The Milky Way is light from distant stars in our galaxy. Zodiacal light is faint sunlight scattered by local dust within the solar system.

Why is it triangular?

It appears brightest near the Sun's position and fades further away because the density of the scattering dust particles decreases with distance from the Sun.

How bright is it?

It is extremely faint and can only be observed when there is no moonlight and zero light pollution.