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Neptune is the eighth and farthest planet from the Sun 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 most dense Neptune was discovered by the German astronomer Johann Galle.

• Distance from Sun 4496, 6 million kms.

• Revolution period 165 years (largest year)

• Rotation period 18 hours.

• Neptune has 13 moons that we know of. The largest moon is Triton.

• It is the coldest planet.

• It is the slowest to move around the sun.

• Its diameter is 49,100 kms.

• It is known as the twin of Uranus due to their similarity of size, mass and

Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. When sky is very dark and very clear Uranus can be seen with the naked eyes. The planet was discovered by William Herschel in March 1787.

• Its distance from Sun is 2869.9 million kms.

• Revolution period is 84 years.

• Rotation period is 16h, and 10 mins.

• It has 27 moons.

• Titania is the largest moon of Uranus.

• It has an atmosphere which is dominated by hydrogen and helium.

• Its diameter is 52, 400 km.

Because of this, we don't know who exactly discovered Mars. We do know it was named after the Roman god of war, because its reddish color reminded people of blood. In 1659, Christian Huygens discovered a strange feature on the surface of the Red Planet. It was later called the Syrtis Major.

We do know it was named after the Roman god of war, because its reddish color reminded people of blood. In 1659, Christian Huygens discovered a strange feature on the surface of the Red Planet. It was later called the Syrtis Major. We have been scared of Martians ever since.

• Distance form sun 228 million kms.

• Revolution period 687 days.

• Rotation period 24 h, 37 min and 22 sec.

• It has two moons Phobos and Deimos.

• Its diameter is 6794 kms.

• Mars is covered with red dust.

• It has an atmosphere composed almost entirely of CO2.

• Its average temperature is -53 0C.

The earth is the largest and the densest of the four terrestrial planets. It is the most wonderful planet of the solar system. Following are the features of the Earth.

• Its distance from the Sun is 150 million kms.

• Its revolution period is 365 ¼ days.

• Its rotation period is 23 hours, 56 minutes, 40 seconds.

• It has one moon.

• It is the densest planet.

• It is also the watery and bios planet.

• Its diameter is 12756 km (7927 miles equatorial and 7900 miles polar diameter)

• It has atmosphere which contains 78% Nitrogen, and 21% Oxygen.

• Its two-thirds surface is covered with oceans.

• The earth’s surface is rich in Oxygen, Silicon, Aluminium, Iron, Calcium.

Venus is one of the planets visible with the unaided eye. Because it has always been easy to see, it's impossible to say who discovered Venus. In fact, after the Moon and the Sun, Venus is the brightest object in the sky – it's likely ancient people thousands of years ago knew about it.

One of the earliest records of Mercury comes from the Sumerians around 3,000 BC. Since Mercury never travels far from the sun in the sky, it is more difficult to see and was probably discovered later than brighter planets like Venus, Mars, Jupiter and Saturn.

• Its distance from Sun is 58 million kms.

• Its revolution period is 88 days.

• Its rotation period is 58 days, 15 hours and 30 minutes.

• It has no moon.

• It is the nearest planet to the sun.

• It is also the smallest planet of the solar system.

• It is the fastest planet.

• Its radius is 2,433 kms and diameter is 4,878 kms.

• It is covered with holes called Craters.

• It has no atmosphere.

• The temperature on mercury vary between 420 0C (7900F) in the day and -180 0C (-2900F) at nights.