GK
THE UNIVERSE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
are large and gaseous
|
|
|
are rocky, dense, and relatively small
|
|
|
orbit farthest from the sun
|
|
|
not in our solar system
|
Detailed explanation-1: -The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth’s terra firma. The terrestrial planets are the four innermost planets in the solar system.
Detailed explanation-2: -The four inner terrestrial planets are dense compared to the four outer planets. The inner planets are made up mainly of dense, solid rock. The outer planets are composed primarily of gas, so their overall density is lower. However, they are larger in size and much more massive!
Detailed explanation-3: -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-4: -There are four relatively small, rocky planets: Mercury, Venus, the Earth, and Mars. Then come the four giants: Jupiter, Saturn, Uranus, and Neptune.