The Universe Part-3

Saturn is especially famous for its peculiar feature of rings. Total seven rings of Saturn has been discovered. It's A,B, D and E rings can be seen from earth. The colour of Saturn from earth seems yellow. Besides Saturn, Jupiter, Uranus and Neptune too have rings.

On October 15, 1997 the Cassini spacecraft was launched to the Saturn and began its revolution around this planet in June 2004.

The Saturn is warmer than Neptune. According to the distance sequence of planets from the Sun (Mercury-Venus-Earth- Mars-Jupiter-Saturn-Uranus-Neptune), Saturn is closer to the Sun than Nepture. Therefore Saturn will be warmer in comparison to Neptune, but Venus is warmer than mercury due to high concentration of CO, in its atmosphere.

Titan is the largest moon (natural satellite) of Saturn. The diameter of Titan is 5,150 km. Prominent satellite of Saturn is Atlas, Epimetheus, Tethys, Lapetus, Dione, Phoebe, Helene and Enceladus, etc. Rhea is, second largest natural satellite of Saturn, having the diameter of about 1,528 km.

The hottest planet in the Solar System is Venus. It's mean temperature is 464°C. Jupiter's satellite Ganymede is the largest Satellites in the Solar System. Phobos and Deimos are the two satellites of Mars. Neptune is surrounded by rings of Methane gas at subzero temperatures. Due to this, the colour of Neptune appears to be Blue-Green.

Uranus's period of revolution around the Sun is 84 years. A day on Uranus is approximately 17 hours and 14 minutes.

The year is largest on Pluto because it is farthest among the other celestial objects from the Sun. Pluto takes the period of 247.9 earth year to complete one revolution around the Sun.

Neptune takes the longest period to make a revolution around the Sun. As we know that planet Pluto has been removed from the category of planets since 2006. Now starting from the Mercury up to Neptune only 8 planet comes into the category of true planets. The time period of revolution of all four planets is given below -

Neptune which is farthest from the Sun, is the coldest planet of our solar system. The temperature of Neptune's surface is -200° C and its atmosphere is made up of Hydrogen, Helium and Methane.

Generally, Pluto is considered as the farthest planet from the Sun. As its orbit lies inside the orbit of Neptune, some times Neptune becomes the farthest planet from Sun. Neptune was farthest from 1979 to 1999 but from 11th February, 1999. Pluto will be the farthest planet for the next 228 years. Hence, it can be seen that some time Pluto and some time Neptune becomes the farthest planet from Sun. As in 2006, Pluto was declared a dwarf planet, hence now Neptune is the correct answer for this question.