“I see great dangers for the human race，” he said in an interview with global forum Big Think. “There have been a number of times in the past when its survival has been a question of touch and go.”

　　“I believe that the long­term future of the human race must be in space，” he said.“ It will be difficult enough to avoid disasters on planet Earth in the next hundred years, let alone the next thousand, or million.”

　　Hawking, who was awarded the Presidential Medal of Freedom last year, has recently voiced many concerns about the future of life on Earth.

　　“If aliens visited us, the outcome would be as much as when Columbus landed in America, which didn't turn out well for the Native Americans，” he said. “Such advanced aliens would perhaps become nomads (游牧民), looking to conquer and colonize whatever planets they can reach.”

　　But Hawking says he's still hopeful for the future of humanity.

　　He told Big Think, “We've made remarkable progress in the last hundred years. But if we want to continue beyond the next hundred years, our future is in space.”

　　Getting to another planet will prove a challenge, not to mention colonizing it for humanity. Katherine Freese from University of Michigan told Big Think, “ the nearest star to Earth is Proxima Centauri which is 4.2 light years away. That means, if you were traveling at the speed of light the whole time, it would take 4.2 years to get there — or about 50,000 years using current rocket science.”

【2017届高考英语一轮复习检测：Unit3　Life in the future （人教版必修5）Word版含答案】相关文章：

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：3（含解析）

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（9）附答案

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（2）模块1 《Unit 2 Heroes》（含解析） 北师大版必修1

★ 2014届高考英语一轮复习课时作业(十八)必修3Module 6《Old and New》（外研版）

★ 北京市2014高考英语一轮复习 练习手册（34）选修7 Unit 4 Sharing（含解析）新人教版

★ 2017届高考英语二轮复习课时训练：21（含解析）

★ 常熟市2014高考英阅读理解语一轮（暑假）训练题（9）及答案

★ 四川省2016届高考英语一轮复习课时作业（45） Module 3 Foreign Food 外研版选修8

★ 2017届高考英语二轮复习书面表达限时测验：4（含解析）

★ 2017届高考英语二轮复习课时训练：4（含解析）