Io is a moon of which planet?

Io is a moon of which planet?

• A. Saturn
• B. Jupiter
• C. Mars
• D. Neptune

Answer: (B)

Io is a moon of Jupiter. It belongs to the group of Galilean moons—Io, Europa, Ganymede, and Callisto—that orbit Jupiter and were first observed by Galileo. What makes Io notable is that Jupiter’s strong gravity tugs on it as it travels around the planet, causing tidal heating that powers intense volcanic activity. This is why Io is famous as the most volcanically active body in the solar system. It’s not a moon of Saturn, Mars, or Neptune, which orbit their own respective planets.

Io is a moon of Jupiter. It belongs to the group of Galilean moons—Io, Europa, Ganymede, and Callisto—that orbit Jupiter and were first observed by Galileo. What makes Io notable is that Jupiter’s strong gravity tugs on it as it travels around the planet, causing tidal heating that powers intense volcanic activity. This is why Io is famous as the most volcanically active body in the solar system. It’s not a moon of Saturn, Mars, or Neptune, which orbit their own respective planets.