Pluto 29 in 1930. It used to be the ninth planet in the solar system 30 the IAU
changed it on August 24, 2006.
Many astronomers argued about 31 Pluto a planet. Some thought that it was too small
to be called a planet- it is 32 smaller than the Moon. So, at a meeting in 2006, the
astronomers decided to take Pluto off the list of planets in our solar system.
Now, there are eight planets in the solar system. But if you are a fan of Pluto, don’t worry.
Astronomers sometimes change the rules. Perhaps they 33 their mind at the next meeting.
Who knows?