Suppose a comet is observed to have a surface of pure ice with very little dust and rock on its surface.What can we say about this comet?

Question

Quizplus · Accepted Answer

Comets that have not previously passed near the sun tend to have a surface of pure ice with very little dust and rock on their surface. As they make multiple passes near the sun, the heat causes the ice to evaporate, leaving behind a layer of dust and debris on the surface. Therefore, a comet with a surface of pure ice and little dust is likely making its first passage near the sun. The origin of the comet cannot be determined based solely on its surface composition.

Suppose a Comet Is Observed to Have a Surface of Pure