The relative size of the inner planets of our solar system: Mercury, Venus, Earth and Mars. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!

Our home, planet Earth, is part of a system of bodies that orbit a central star – the Sun. This solar system consists of four inner rocky planets and four outer gas giant planets as well as an ...

The inner four planets (Mercury, Venus, Earth, and Mars) are rocky and have solid surfaces that can be walked on. When the solar system formed, rocks (and other dense, heavy materials in the dust ...