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

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 ice into gas, creating a visible tail.

Which Statement Is Not Thought to Be True of All