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* Mars is the fourth planet from the sun and the second smallest planet in the Solar System, after Mercury.

* Distance to Earth: 140,000,000 miles. * Gravity: 3.711 m/s * Radius: 2,106 miles * Surface area: 55.91 million sq. miles * Moons: Phobos and Deimos * Mass: 639E21 kg

Mercury * Mercury is the smallest and closest to the sun of the eight planets in the Solar System, with an orbital period of about 88 earth days.

* Distance from Sun: 35,980,000 miles * Gravity: 3.7 m/s * Radius: 1,516 miles * Surface Area: 28.88 million sq. miles * Mass: 328.5E21 kg * Moons: 0

Neptune * Neptune is the eight and farthest planet from the in the solar system. It is the fourth largest planet by diameter and the third largest by mass. Among the gaseous planets in the solar system, Neptune is the densest planet. * Distance from Sun: 2,798,000,000 miles * Gravity: 11.15 m/s * Radius: 15,299 miles * Surface Area: 2.941 billion sq. miles * Mass: 102.4E24 kg * Moon: Triton, Nereid, Naiad, Larissa, Proteus, Galatea, Despina, Thalassa, Neso, Halimede, Psamathe, Laomedeia, Sao.
* Uranus is the seventh planet from the sun. it has the third largest planetary radius and fourth largest planetary mass in the solar system

* Distance from Sun: 1,787,000,000 miles * Gravity: 8.69 m/s * Radius: 15,759 miles * Surface Area: 3.121 billion sq. miles * Mass: 86.81E24 kg * Moons: Miranda, Titania, Umbriel, Oberon, Ariel, Puck, Cordelia, More

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