1, the orbit is closest to the sun (mercury)
2. There is a beautiful and complicated halo (Saturn)
3. The brightest star in the sky (Venus)
4. Named after Neptune, the sea king who ruled the Crystal Palace in ancient Roman mythology.
5. The largest star among the eight planets (Jupiter)
6. Named after Uranus, the king in Greek mythology.
7. Ancient name of comet (Mars)
8. The only living planet in the solar system (Earth)
Extended data:
The Origin of Nine Planets Becoming Eight Planets
The nine planets mentioned before 2006 refer to Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
Because a celestial body with enough mass and spherical shape can't clear other celestial bodies near its orbit, it is called a "dwarf planet". Pluto just fits this definition, so it is confirmed as a "dwarf planet" by the International Astronomical Union.
On August 24th, 2006, the 26th International Astronomical Union held in Prague passed Resolution No.5, which downgraded Pluto to a dwarf planet and eliminated it from the nine planets in the solar system. Since then, the solar system has changed from nine planets to eight.