How do we know where comets come from?
A. Those that come from the Kuiper belt are composed of slightly different materials than those from the Oort cloud.
B. The comets from the Oort cloud travel at much greater velocities than those from the Kuiper belt.
C. The comets from the Oort cloud don't produce a tail, but those from the Kuiper belt do.
D. The comets from either location have a trajectory or pathway that can be traced back to their starting point once we see them.
E. Astronomers only guess where these comets come from - they don't know for sure.
Answer: D
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