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The Planets

On Venus, circular patterns of fractures on the surface resulting from the release of interior planet heat.
Moons that make up a miniature solar system around Jupiter.
The largest moons of Jupiter (Io, Europa, Ganymede and Callisto).
A highly corrosive acid made from sulfur dioxide (H2SO4).
Moving in a backward direction.
The region of space between the orbits of Mars and Jupiter in which most asteroids are located.
When a dense carbon dioxide atmosphere traps heat from the Sun and raises a planet's surface temperature.
Any of the thousands of small bodies of from 775 km to less than a mile (1.6 km) in diameter that revolve about the Sun in orbits lying mostly between those of Mars and Jupiter; also called minor planets.
The magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field (Jupiter's is many million times as intense as Earth's).