2. According to Clinton’s writing, solving conflicts between people is a problem in the space. These conflicts are built from living together for a long time, the crowded environment, and the stressful and dangerous work.
3. Cory Brunish stated in his article that it is waste of money to explore the Mars. We should use the money on solving problems on Earth, such as curing diseases, cleaning up the environment, and fighting hungry, homelessness, poverty, and unemployment.
4. An article in Time Magazine reports that getting to Mars quickly is not only for its last for the long
time journey, but also to protect astronauts’ safety. The exposure radiation in the space can cause astronauts’ death, because the Earth’s magnetic field shield the radiation.