Pluto, which is assumed to be one of the planets in the solar system.

This reading and lecture are both about Pluto, which is assumed to be one of the planets in the solar system. The author of the reading believes that Pluto lost its belonging to the solar system. The lecturer doubts the article's assertions. She believes that its membership in the solar system was not lost. First, the author remarks that Pluto is no longer counted as a planet in the solar system. It is stated that this decision was made between scientists after a vote at the conference of the International Astronomical Union. This point is doubted by the lecturer. He says that excluding Pluto from the solar system started a major dispute among scientists that was called the Pluto war. He further argues that the vote was based on ten percent of the entire membership of the Astronomical Union because five hundred astronomers out of ten thousand astronomers showed up. Second, the author argues that Pluto's size was estimated to be similar to that of Earth. However, the article remarks that Pluto's size was later found to be smaller than the Earth's and other moons. The speaker refutes this argument. He suggests that many scientists believed that if an object cleared its orbit, then it was a planet. He elaborates on as much by stating that Earth, Mars, Neptune, and Jupiter have asteroids as neighbors, so they cannot clear their orbit but are a planet. Finally, the author states that the reclassification of Pluto honors the fact that the UIC decision "science is self-correcting". The article establishes that new children would not know that Pluto is one of the solar systems. The speaker, meanwhile, posits that the UI decision disappointed a lot of people. He puts out the idea that the children would not forget about Pluto because the 13th day of the march was named Pluto Day.