Hell-Bop Comet Comet is a cosmic object made of dust , ice and gas. A comet is a tiny icy solar object that exhibits spectacular commas (a thin , transient atmosphere) and sometimes a tail as it orbits the Sun. This is due to the effect of the sun's radiation and solar wind on the comet's nucleus. The comet's nucleus is made up of a weak collection of ice , dust, and tiny rock particles. Widths range from a few hundred meters to ten kilometers. And hundreds of millions of km in tail length. May be up. Humans have been observing comets since time immemorial.