Try to understand the italicized words in the following sentence

Try to understand the italicized words in the following sentences from the context. Write the word(s) in the space given after each sentence. 5. A white dwarf is a dead star. With its nuclear forces extinguished,all that remains is a slow inexorable cooling to blackness.(white)_______
【正确答案】：a dead star
【题目解析】：P145