GENERAL KNOWLEDGE

GK

THE UNIVERSE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
how does the composition of a star differ from the composition of a planet?
A
Stars are rocky or made out of gas; planets are composed of hot gases.
B
Planets are either rocky or made out of gas; stars are composed of hot gases.
C
Planets are bigger and less dense than stars
D
Stars are either terrestrial or gas giant stars; planets are composed of gas and emit light.
Explanation: 

Detailed explanation-1: -The temperature of the early solar system explains why the inner planets are rocky and the outer ones are gaseous. As the gases coalesced to form a protosun, the temperature in the solar system rose. In the inner solar system temperatures were as high as 2000 K, while in the outer solar system it was as cool as 50 K.

Detailed explanation-2: -The four inner planets have shorter orbits, slower spin, no rings, and they are made of rock and metal. The four outer planets have longer orbits and spins, a composition of gases and liquids, numerous moons, and rings. The outer planets are made of hydrogen and helium, so they are called gas giants.

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