Final answer:
Astronauts use a life support system on their spacecraft to provide us with breathable air in space.
Step-by-step explanation:
Astronauts allow us to breathe in space by using a life support system on their spacecraft. This system consists of various components including an oxygen supply, carbon dioxide removal system, and a controlled atmosphere. The oxygen supply provides astronauts with breathable air, while the carbon dioxide removal system removes the carbon dioxide that they exhale. Additionally, the controlled atmosphere helps maintain the appropriate levels of oxygen, nitrogen, and other gases necessary for humans to survive.
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