Breathable atmosphere?
I never read the original Ray Bradbury book. I saw parts of the episodes when they were broadcast in 1980 and not too long ago on YouTube. The first two astronauts land without space suits as do the subsequent ones.
Did Bradbury, in the stories, believe that Mars had a breathable atmosphere for humans? About 95 percent of the atmosphere is carbon dioxide, http://www.space.com/16903-mars-atmosphere-climate-weather.html
Wasn't it known when the series went into production that the humans cannot walk freely around Mars without space suits because of the atmosphere's composition?