reading for webbase Space and Flight

1. Human Adaptation to Space
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In April 1961, Russian cosmonaut Yuri Gagarin made history when he
became the first man to travel to space. On July 20, 1969, American
astronaut Neil Armstrong became the first man to walk on the Moon. Now
that humans have been to the Moon and robots have been sent to Mars,
some people believe the next step is for humans to visit Mars. There’s no
doubt that the first person to walk on Mars will become as famous as
Gagarin or Armstrong, and many astronauts would love the opportunity.
But what is space travel really like for the men and women who go on these
missions?