Question

Why are the outer planets referred to as gas giants?

Answer 1

all are not gas giants....mars,venus and mercury are not giants.....jupiter and rest of the planets except pluto are gas giants because they are made up of gas specially helium, hydrogen,xenon,etc.

Answer 2

Answer:

Figure below shows the relative sizes of the outer planets and the Sun. These planets are much larger than the inner planets and are made primarily of gases and liquids, so they are also called gas giants. This image shows the four outer planets and the Sun, with sizes to scale.

Explanation: i hope it is correct now