14 Inner Planet Facts For Kids

1. The inner planets are the four terrestrial planets in our Solar System.
2. The four planets designated as the inner planets are Mercury, Venus, Earth, and Mars.
3. All four of the inner planets have a dense and rocky composition.
4. The largest inner planet is Earth, and the smallest inner planet is Mercury.
5. The combined surface area of all the inner planets is 459,255,563 square miles.
6. The inner planets orbit the Sun faster than the outer planets.
7. The inner planets together only account for <1% of the mass orbiting the Sun in our Solar System.
8. Only 3 of the 219 moons (natural satellites) in our Solar System orbit an inner planet.
9. Mars has two moons, Earth has one moon, and both Mercury and Venus have no moons.
10. The closest inner planet to the Sun is Mercury at 35,983,125 miles or 0.39 astronomical units.
11. The farthest inner planet from the Sun is Mars at 141,637,725 miles or 1.52 astronomical units.
12. The densest planet in our Solar System is the inner planet Earth.
13. The planet that has been explored the most in our Solar System is the inner planet Earth.
14. Due to the proximity of Earth to the inner planets, astronomers will never discover a fifth inner planet.

Inner Planet Pictures

If a picture is worth a thousand words, then the below images will be helpful for your research on the Inner Planets. Below are six pictures of the Inner Planets. These pictures should help you better understand Inner Planets, one of the two regions of our Solar System.

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