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信息发布者：

travel in space

live on other planets/

another planet

travel at the speed of light

because of the rapid

increase in population

at present

carry large numbers of passengers

with the development of technology

become more and more

crowded and polluted

feel ill/uncomfortable

in the form of pills

prevent oneself from

floating off into space

compare...with...

in some ways

be of great help to humans

increase rapidly

because of low gravity

remind sb of the tasty food

circle around the Sun

be in agreement

be aware of

have a similar environment

carry out a survey

start with a discussion

after all

the guide to living on Mars

produce no air pollution

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