填空题 Questions 7-13
Complete the sentences using NO MORE THAN THREE WORDS for each answer. Write your answers in boxes 7-13 on your Answer Sheet.

填空题 Hydrogen will turn to helium after ______ occurs.

填空题 The colour of the red giant is formed as the ______ becomes smaller and the outer areas cool.

填空题 At 200,000,000℃ the star's helium atoms fuse into carbon atoms, and then the star

填空题 Unlike small and medium-sized stars, large stars ______ quickly.

填空题 A black hole's ______ stops light from being emitted.

填空题 Astronomers knew about ______ before they were able to confirm their existence.

填空题 Planets and stars are likely to consist of ______ from exploded celestial bodies.