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阅读下列短文,回答1—4题。美国5个著名研究机构的天文学家日前报告说,他们发现银河系中央存在一个反物质源,它喷射出的反物质在宇宙中形成了一个高达2940光年的反物质
Read the following essay and answer questions 1-4. Astronomers from five prominent US research institutes recently reported that they found a source of antimatter in the middle of the Milky Way. The antimatter they injected produced an anti-matter up to 2940 light years in the universe.