This is an American science fiction movie about three astronauts who are on a mission to Mars. When they find a stowaway on board, the crew must figure out a solution, since they only have enough oxygen for three people.
Vocabulary:
space shuttle: a space vehicle
stowaway: a person on board a ship who wasn't supposed to be there
lifeguard: a person who works at a pool or beach to protect people from drowning
oxygen: the element we use for breathing
ethical or moral dilemma: a problem in which it's not clear what decision is right or wrong
unconscious: not awake
concussion: injury caused by being hit on the head