Scientists want to study Jupiter because the planet may hold clues about the formation of the solar system. According to Scott Bolton, an astrophysicist at the Southwest Research Institute in Texas, Jupiter is like a time capsule. Many astronomers theorize that Jupiter was the first planet in the solar system to form. They believe that Jupiter got most of the mass that remained after the sun's creation, and its enormous gravity field has enabled it to hold on to that original material. Astronomers also believe that this is why the planet is so immense. Jupiter is so big that it could contain everything in the solar system, minus the sun.

Scientists believe Jupiter could be _________.

A reactive
B informative
C lusterless
D polluted