The Universe Part-3

In the beginning, Mars was treated equivalent to Earth because of occurrence of ice cap and water ice on Mars: In Mars atmosphere, it has 95.1% Carbon dioxide, 2.59% 1000 Nitrogen, 1.94% Argon, 0.16% Oxygen, 210 ppm water etc. Mars polar ice caps and water ice is most relevant for the presence of life on Mars. The average temperature of Mars (-65°C) is quite similar to Earth (-85°C). Mars rotates on its axis approx. 24.6 hours and revolves around sun approx 686.98 Days.

Europa is one of the moons of Jupiter. Voyagerl spacecraft was launched by NASA to research whether life is possible on it. Europa is frozen and covered with a layer of ice. Its surface seems like the frozen Ocean on Earth. The depth of this frozen ocean is approx. 60-150 kilometre. If it is true, then Europa will be a place in the solar system besides Earth, where such amount of water is available.

Phoenix Mars Lander was launched on 4th August, 2007 and landed on 25 May, 2008 at North pole on Mars. On 10th November, 2008 the mission officially ended. Phoenix had given the information about the presence of ice on Mars. Note: Since the exact date is not given in the option so, closest date 26 May, 2008 will be the answer.

Jupiter is the largest planet of the solar system. The four largest moons (IO, Europa, Callisto, Ganymede) are Known as Galilean moons as these were discovered by Galileo Galilei in 1610.

According to size planets of our solar system (In Diameter) are as follows:

Jupiter (142,984 km)

Saturn (120,536 km)

Uranus (51,118 km)

Neptune (49,528 km)

Earth (12,756 km)

Venus (12,104 km).

Mars (6,792 km)

Mercury (4,879 km)

The heaviest planet of our Solar System is Jupiter. Its diameter is 142984 kilometer and the average density is 1326 kg/m³. It is also notable that Jupiter is the planet of the solar system which spining on its axis with maximum speed.

In the given options Jupiter takes maximum time ie., 11.86 years to complete a revolution around the Sun, Earth takes 365.25 days, Mars takes 686.98 days and Venus takes 224.70 days.

The rings of Jupiter were first discovered by the Voyager 1 Spacecraft in 1979. These rings are called "Jovian rings". Jupiter's rings are supposed to be made up of silicates and dust particles. Due to sparse and almost transparent, it is hard to see them but their existence can't be assumed to be improbable.

Jupiter is the largest planet of our Solar System and also has a 2 highest number of natural satellites or moons. At present total 95 moons or satellite of Jupiter have been discovered, When the question was asked Jupiter was the answer now the Saturn is the correct answer, so option (c). The number of moons of other planet is as follows-

Saturn takes 29.456 years to complete one revolution around the Sun. Hence, option (c) is the correct answer.