1How many years ago was the Sun formed?
2Do the stars of the universe differ from the Sun in size, temperature, colour and age?
3What might the structure of other stars be like, with a heat producing core and other layers like the Sun's? And does the Sun's core produce heat continuously forever?
4How is a star born? Write the stages in order.
5What is the difference between a nova and a supernova, and what happens to the scattered particles afterwards?
6How do a neutron star and a black hole form?
7How can a star's age be judged from its colour?
8What is a light year, and why is this unit needed for measuring the distances of stars?
9What is the relation between a white dwarf and a black dwarf?