GK
SOLAR SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Gamma Rays
|
|
|
Plasma
|
|
|
Ice and Gas
|
|
|
Rocks
|
Detailed explanation-1: -Rocky planets, like Earth, formed near the Sun, because icy and gaseous material couldn’t survive close to all that heat. Gas and icy stuff collected further away, creating the gas and ice giants.
Detailed explanation-2: -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-3: -Nearest to the Sun, only rocky material could withstand the heat when the solar system was young. For this reason, the first four planets – Mercury, Venus, Earth, and Mars – are terrestrial planets. They are all small with solid, rocky surfaces.