Why do astronomers believe Triton may have been a planet that was captured by Neptune?
A)It orbits Neptune in the opposite direction of Neptune's rotation.
B)It is too large to have been formed in the jovian nebula that formed Neptune.
C)It has an atmosphere and a measurable greenhouse effect.
D)It undergoes seasonal changes.
E)It is colder than any other moon or planet.

Question

Quizplus · Accepted Answer

Triton's retrograde orbit, or opposite direction of Neptune's rotation, is a strong indication that it was captured by Neptune rather than formed with the planet.

Why Do Astronomers Believe Triton May Have Been a Planet