VOCABULARY Complete each sentence using a word from the article. Use the words in bold to help you. 1 We have to p asteroids from entering the Earth's atmosphere. 2 Do we havet to find a way to save the planet? 3 Protecting the Earth will i building more powerful telescopes. 4 Technology is r. for major changes in the way we live our lives. 5 How do astronauts p for space travel? 6 Is it 1 that we'll discover life on other planets in the future? 7 NASA isn't r for a manned mission to Mars yet.

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