question: How do astronauts live in space and survive without gravity, fresh air, and normal food?

Living in space is very different from living on Earth. Astronauts live on the International Space Station where there is no gravity. Because of this they float instead of walk. Astronauts have to exercise every day to keep their muscles and bones strong. They breathe air that is recycled inside the space station. Astronauts eat special food that does not float away. These things help astronauts stay healthy and safe while living in space.

Question: What would life be like on Mars for humans? 

Life on Mars would be very hard for humans. Mars is cold and has no air that people can breathe. Humans would need space suits to go outside and special buildings to live in. People would also need protection from radiation from the Sun. Scientists are studying Mars to learn how humans might live there in the future. Living on Mars would be challenging but possible with the right technology.    

question: How could humans live on Mars safely and survive there?

Humans cannot survive on Mars without help. The planet is very cold and has almost no oxygen. NASA says people will need special habitats that provide air and water. Astronauts will also need to wear space suits when they go outside. Scientists are designing ways to grow food on Mars. They also plan to make systems that clean water and make oxygen. These ideas show that humans can live on Mars if we have the right technology. With careful planning, life on Mars is possible.