The eight planets are arranged from small to large.

The order of the eight planets from small to large is: Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn and Jupiter.

It doesn't have to be big, it has to be big. For example, Jupiter is big enough to become a star, but its interior is gas, which leads to the situation that its mass is not enough to become a star.

The descending order of the eight planets is: Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn and Jupiter. If the volume of the earth is 1, then the volume ratio between the corresponding planets is 0.056, 0. 15, 0.86, 1, 60, 65,745, 1330.

Introduction of the Eight Planets:

The four inner planets, Mars, Mercury, Venus and Earth, belong to Earth-like planets with small mass and volume. Saturn and Jupiter are two gaseous planets, of which Jupiter is the largest of the eight planets, and its volume is more than 1300 times that of the earth, but only one thousandth of that of the sun; The earth can hold the sum of 18 mercury volumes.

However, it doesn't have to be large in size and mass. Because many planets belong to gaseous planets, their volume may be very expanded, but because the interior is full of gas, their mass will become smaller, such as Jupiter. So the eight planets in descending order of mass are: Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn and Jupiter.