the dust left behind a comet, reflecting sunlight.
Broad, curved, diffuse tail composed of fine dust grains blown away from the coma by radiation pressure.
One of two types of tails associated with comets. As a comet approaches the Sun, solar energy releases ice and dust particles. These particles form a diffuse shell around the comet. The dust particles lag behind the comet tracing its orbital path, scattering sunlight and forming a dust tail.