What Is Unique About the Pluto-Charon System, Compared with All

question 142

Multiple Choice

What is unique about the Pluto-Charon system, compared with all other planets and dwarf planets in the solar system?

• A) Both Pluto and Charon are volcanically active, with lava flows and vents of sulfur dioxide gas.
• B) Charon is an icy moon, but it is in orbit around a giant planet made mostly of liquid hydrogen.
• C) Pluto has only one satellite.
• D) Both Pluto and Charon are in synchronous rotation, so each object maintains the same face toward the other object at all times.

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Definitions:

Republic

A form of government in which power resides in elected individuals representing the citizen body and government leaders exercise power according to the rule of law.

Midpoint

A point that is exactly in the middle between two other points.

19th Century

The period from 1801 to 1900, marked by significant political, cultural, and technological changes worldwide.

Foreign-Born

Individuals who were born outside the country in which they currently reside and have immigrated to that country.