For thousands of years, humans have explored the Earth. Now astronomers are exploring space, looking...Đoạn văn31/40Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. The main idea of the passage is .the problemwith Gliese581gthecreationofanalternativeSunthedevelopmentofspace explorationthesearch foranewplanettoliveonGiải thíchD. the search for a new planet to live on