This story is taken from Explorer magazine, a nonfiction reading resource for learners in second to fifth grade, published by National Geographic Society. Have your learners read the story and then test their comprehension with the reading and/or content activities included in the story.

Mission to Mars

Getting humans to Mars is difficult enough. Once there, it will be at least just as tough for them to survive on that planet.

astronaut
Noun

person who takes part in space flights.

fuel
Noun

material that provides power or energy.

Noun

environment where an organism lives throughout the year or for shorter periods of time.

modular
Adjective

made of individual, complete units or sections.

orbit
Noun

path of one object around a more massive object.

resource
Noun

substances such as water, air, shelter, and food sources which are valuable in supporting life.

shelter
Noun

structure that protects people or other organisms from weather and other dangers.