Stunning images make up this slide show on the inner planets of our solar system. While visiting Mercury, Venus, Earth, and Mars, viewers also are introduced to the International Space Station and the Spirit Rover on Mars. Follow this...

Mercury, Venus, Earth, and Mars are collectively known as the terrestrial planets. Although part of the same group, each planet has its own set of characteristics. Scholars explore the characteristics that make the planets unique and...

Has the solar system always been like it is today? A lesson presentation begins with a discussion of the formation of our solar system. It continues with a compare and contrast of the inner and outer planets.