LAST week's decision by the International Astronomical Union (IAU) to  _ Pluto   _ its planetary status, held since its discovery in 1930, has made a lot of people sad. "Pluto," American science writer Dava Sobel writes in her book "The Planets", "still has an emotional hold on planethood. People love Pluto. Children identify with its smallness. Adults felt it hard to accept its isolated existence." Many people felt sorry about Pluto's demotion . "I just cannot accept this at this time," says Liu Ming, 29, who runs a small company in prefix = st1 /Shanghai. "I was taught that 'the Nine Great Planets' formed our solar system since primary school. And now they suddenly decrease the planets to eight. This will take some time for most of us to absorb it," says Liu. Ordinary people are simply not used to it, but for some professionals, especially the persons in charge of planetariums  and educators, the change has become a real headache. The "eight instead of nine" change will affect thousands of planetariums around the world. Schools will also be greatly affected.       InChina, teachers are anxious as outdated textbooks are printed and given out to the remotest corner of the country for school children ready to start a new term soon. According to the Ministry of Education, new textbooks with changed contents will not be available until next year. Zhao Zhiheng, a member of the Astronomy Association from Tianjin, suggested that primary and middle school teachers be trained in the improved knowledge, and that the media carry more stories to let people know about the change as soon as possible. In the following suggestions, which one is made by Zhao Zhiheng?
Planetariums around the world should adapt to the change quickly. The media should make it known to people as soon as possible. Teachers needn't be trained in improved knowledge as soon as possible. Schoolchildren should be ready for the new knowledge.