HELSINKI — China’s Long March 10A rocket is set to have its first flight in 2026, in what will be a crucial step in the country’s efforts to get astronauts on the moon. A model of the Long March 10A, a single-core rocket for launching crew, is set to be unveiled at the Zhuhai Airshow in southern China, due to open Nov. 12. The rocket is set to have its debut launch in 2026, according to a Nov. 5 report from Science and Technology Daily, an official Chinese ministry newspaper. …