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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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