Why did the Sarah Jane adventures stop?

How can CAD be used in aerospace? Can it rain during the sunset? What type of star is gamma piscium? When was Scientist - musician - born? Why is the moon red or orange at times? What is the average age for a giant star? What discovery did Claudius Galen make? Where did chakana warrick the scientist was born? Is Zeus Yahweh's father? Are all constellations seen from earth located in the milky way galaxy? Who is Helios in The Odyssey? What type of stellar corpse will the Sun leave behind? what is Space like? Why do sun spots appear dark? What are 3 words starting with T that describe Demeter? Do people age slower on the moon? What percent of the moon is lit by the sun at any time how can you tell? What is the difference between a manned and unmanned spaceflight? What are the effects of cloud cover on air temperature? What are rings in the solar system?