Diameter: 142984 km (equator)

Mass: 1.900e27

2. Saturn:

Diameter: 120536 km (equator)

Quality: 5.68e26

3. Uranus:

Diameter: 5 1,118km (equator)

Quality: 8.683e25

4. Neptune Neptune:

Diameter: 49,532 km (equator)

Mass: 1.0247e26

5. Earth:

Diameter:12756.3km.

Quality: 5.9736e24

6. Venus Venu:

Diameter: 12,103.6km.

Quality: 4.869e24

7. Mars Mars:

Diameter: 6794 km

Quality: 6.42 19e23

8. Mercury:

Diameter: 4,880 kilometers

Mass: 3.30e23

9. Pluto Pluto:

Diameter: 2274 km

Mass: 1.27e22

Extended data:

Degenerate Pluto;

After the General Assembly of the International Astronomical Union was held on August 24, 2006, Pluto was downgraded to a dwarf planet by voting, leaving only eight planets in the solar system. The saying of "nine planets" has become history, and it has been replaced by "eight planets".

Pluto was kicked out of the planetary ranks. However, there are gains and losses, and Pluto's dramatic fate has won it a place in the history of linguistics.

Pluto's "demotion" aroused the deep sympathy of the American people for Pluto. The word "Pluto" originally had only a noun meaning, and was given a verb meaning by linguists, meaning "belittle or belittle someone or something". The past tense "Pluto" of "Pluto" means "degraded, degraded". For example, the phrase "you are Pluto" can mean "you have been demoted"; "The dollar is depreciating" may mean "the dollar is depreciating".

At the 26th International Astronomical Union Congress held in 2006, Pluto was officially excluded from the list of nine planets in the solar system and was classified as a dwarf planet. Since then, Pluto has been considered as one of the largest celestial bodies in the Kuiper asteroid belt.

The Illinois government of the United States believes that Pluto has been wrongly "downgraded". Its statement pointed out that only 4% astronomers in the International Astronomical Union voted for "demoting" Pluto. So Pluto was actually treated unfairly.

Pluto was discovered by American astronomer clyde tombaugh in 1930. It was previously classified as a planet because people initially mistakenly thought it was the same size as the earth. Pluto is the smallest of the nine planets, much smaller than those eight. Pluto is only about 2300 kilometers in diameter, smaller than the earth's satellites. Its orbit is also very special, and it has an angle with the orbits of the other eight planets.

Especially after the discovery of Xena in 2003, Pluto's position was further shaken. Zena is about 3,000 kilometers in diameter, and its distance from the sun is about three times that of Pluto. It takes 560 years to go around the sun. Scientists from California Institute of Technology found it in the Kuiper Belt and numbered it UB3 13. After two years of observation, they announced this discovery to the outside world in July 2003, and caused a heated discussion on whether there is the tenth largest planet in the solar system.

Pluto (pronounced míng wáng xρng) was originally considered as a big planet in the solar system, but it was classified as a dwarf planet by Resolution No.5 at the 26th International Astronomical Union held in Prague on August 24th, 2006. In June 2008, the International Astronomical Society took Pluto as its prototype.

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