Which statement is not thought to be true of all comets in our solar system?
A)All comets are leftover planetesimals that originally condensed beyond the frost line in the solar nebula.
B)All comets are icy in composition.
C)Comets always have tails.
D)All comets orbit the Sun.

Question

Quizplus · Accepted Answer

Comets do not always have tails. They develop tails only when they come close enough to the Sun for its heat to vaporize the comet's ices, releasing gas and dust that form the tail. When comets are in the outer reaches of the solar system, far from the Sun, they do not have tails.

Which Statement Is Not Thought to Be True of All