Wyjaśnienie:
1). I believe that the volunteers for Mars One are extremely brave because they are going to a place no one ever explored in person.
2). Astronauts may experience problems with food and water when living on Mars because food is really hard to grow as it's really dry out there, there's also no proof of water in large quantities.
3). I think that we should learn more about space exploration in school because it's something interesting and we don't really get to learn about it anywhere.
