Solar System, Inner
The inner solar system is the region of the solar system that stretches between the Sun and the asteroid belt. It contains the terrestrial planetsMercury, Venus, Earth, and Mars (in order of distance to the Sun), as well as the Earth’s Moon and Phobos and Deimos, which orbit Mars. In addition, the inner solar system is home to an unknown number of small bodies, asteroids, and comet nuclei. Furthermore, the inner solar system contains the habitable zone of our solar system.