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Mercury is the smallest planet in our solar system. It's just a little bigger than Earth's moon. ... Along with Venus, Earth, and Mars, Mercury is one of the rocky planets. It has a solid surface that is covered with craters.

The radious of Mercury is about 2,440 km and distance from the Sun is 57.91 million km.

Venus is the second planet from the Sun and is the second brightest object in the night sky after the Moon. Named after the Roman goddess of love and beauty, Venus is the second largest terrestrial planet and is sometimes referred to as the Earth's sister planet due the their similar size and mass. The radious of Venus is about 6,052 km and distance from the Sun is 108.2 million km.

Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. ... Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans. The radious of Earth is about 6,371 km and distance from the Sun is 149.6 million km.

 

Mars is the fourth planet from the Sun and is the second smallest planet in the solar system. Named after the Roman god of war, Mars is also often described as the “Red Planet” due to its reddish appearance. The radious of Mars is about 3,390 km and distance from the Sun is 227.9 million km.

The planet is named after Jupiter, the king of the Roman gods in mythology. Jupiter is called a gas giant planet. Its atmosphere is made up of mostly hydrogen gas and helium gas, like the Sun. The radious of Jupiter is about 69,911 km and distance from the Sun is 778.5 million km.

Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth. It has only one-eighth the average density of Earth, but with its larger volume Saturn is over 95 times more massive. The radious of Saturn is about 58,232 km and distance from the Sun is 1.433 billion km.

It appears that Uranus does not have a rocky core like Jupiter and Saturn but rather that its material is more or less uniformly distributed. Uranus' atmosphere is about 83% hydrogen, 15% helium and 2% methane. Like the other gas planets, Uranus has bands of clouds that blow around rapidly. The radious of Uranus is about 25,362 km and distance from the Sun is 2.871 billion km.

Despite being smaller than Uranus, Neptune has a greater mass. Below its heavy atmosphere, Uranus is made of layers of hydrogen, helium, and methane gases. They enclose a layer of water, ammonia and methane ice. The inner core of the planet is made of rock. The radious of Neptune is about 24,622 km and distance from the Sun is 4.495 billion km.

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