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MERCURY

The smallest planet in the Solar System and the closest to the Sun. It is named after the Roman god Mercurius (Mercury), god of commerce, messenger of the gods, and mediator between gods and mortals, corresponding to the Greek god Hermes. The radius of Mercury is 2,439.7 km from the sun.

VENUS

The second planet from the Sun. It is named after the Roman goddess of love and beauty. Venus is a terrestrial planet and is sometimes called Earth's "sister planet" because of their similar size, mass, proximity to the Sun, and bulk composition. The radius of Venus is 6,051.8 km from the sun.

EARTH

The third planet from the Sun and the only astronomical object known to harbor life. About 29.2% of Earth's surface is land consisting of continents and islands. The remaining 70.8% is covered with water, mostly by oceans, seas, gulfs, and other salt-water bodies. The radius of Earth is 6,371 km from the sun.

MARS

The fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the "Red Planet". The radius of Mars is 3,389.5 km from the sun.

JUPITER

The fifth planet from the Sun and the largest in the Solar System. Jupiter is the third-brightest natural object in the Earth's night sky after the Moon and Venus. The radius of Jupiter is 69,911 km from the sun.

SATURN

The sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. Saturn is named after the Roman god of wealth and agriculture. The radius of Saturn is 58,232 km from the sun.

URANUS

The seventh planet from the Sun. Its name is a reference to the Greek god of the sky, Uranus, who, according to Greek mythology, was the grandfather of Zeus (Jupiter) and father of Cronus (Saturn). The radius of Uranus is 25,362 km from the sun.

NEPTUNE

The eighth and farthest-known Solar planet from the Sun. It is 17 times the mass of Earth, slightly more massive than its near-twin Uranus. The radius of Neptune is 24,622 km from the sun.