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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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