GK
SOLAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Neptune
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Uranus
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Earth
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None of the above
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Detailed explanation-1: -Neptune is one of two ice giants in the outer solar system (the other is Uranus). Most (80% or more) of the planet’s mass is made up of a hot dense fluid of “icy” materials – water, methane, and ammonia – above a small, rocky core.
Detailed explanation-2: -It is probably not possible for a planet to be entirely liquid. This is because a planet needs to be ‘self-gravitating’ so that it holds its spherical shape under gravity. It thus requires a substantial amount of mass, which means the pressure and temperature in the inner regions are usually high.
Detailed explanation-3: -It is also believed that there are large amounts of water (again in the form of ice) on Mars. The reason that only the Earth has liquid water is that all the other planets and moons are either too hot, and whatever water is there boils away, or they are too cold, and whatever water is there freezes.