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 that “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.”

60. Humans are advised to abandon Earth mainly because _____.

A. aliens will take up our home planet soon

B. many disasters will happen on the Earth

C. resources will be used up in the future

D. humans need larger space to live in

61. Thinking about the future of humans, Hawking feels that _____.

A. humans will probably become extinct

B. aliens are the biggest future threat to humans

C. other planets are ready for humans to reach

D. the earth will not be habitable for humans

62. What is the writer's key point in the last paragraph?

A. It is impossible to get to another planet in space.

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