NASA @NASA
The atmosphere on Mars is mostly carbon dioxide w/ no breathable oxygen. Not to mention the landscape is freezing, w/ no protection from the Sun's radiation. How will future astronauts survive? Mars 2020 will test the technology to make it possible. More: https://t.co/ory8HvtnC0 https://t.co/CjHyLsZGBn — PolitiTweet.org