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http://www.smplanet.com/planets/planetintro.html

Provides interactive quizzes on basic facts of the solar system. Features three different levels of difficulty.

http://www.eoascientific.com/interactive/the_solar_system_planets/the_solar_system.html

An interactive exercise demonstrating the planets Mercury, Venus, Earth and Mars formed at regular distance intervals from the Sun. It offers the possibility to the planets according to their relative distance.

The Outer Planets

http://www.eoascientific.com/interactive/the_solar_system_planets/nine_planets.html

An interactive exercise demonstrating the planets formed at regular distance intervals from the sun. Arrange the planets according to their relative distance.