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信息发布者：

travel in space

travel at the speed of light

at present

with the development of technology

feel ill/uncomfortable

prevent oneself from

floating off into space

in some ways

increase rapidly

remind sb of the

tasty food

be in agreement

have a similar environment

start with a discussion

the guide to living on Mars

live on other planets

/another planet

because of the rapid increase

in population

carry large numbers of passengers

become more and more crowded and polluted

in the form of pills

compare...with...

be of great help to humans

because of low gravity

circle around the Sun

be aware of

carry out a survey

after all

produce no air pollution

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