“What type of planet is Mars?” is a question that many readers ask. Mars is one of the four terrestrial planets. Mercury, Venus, and Earth are the other three. All of the terrestrial planets are made up of rock and metals. read more
The final terrestrial planet is Mars. Mars is roughly one-half the diameter of Earth, which leads scientists to speculate that the core has cooled and solidified. The depth of the crust and mantle are not known for sure, but the average planet density is 3.930 g/cm 3. read more
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury. read more