Spaceships and space stations are equipped with advanced life support systems to maintain a habitable environment for astronauts. These systems include air filtration and circulation systems that help remove impurities, odors, and excess humidity from the air, which can be caused by astronauts' farts, among other things. The systems utilize filters with activated charcoal or other materials to absorb and neutralize contaminants, ensuring that the air inside the spacecraft remains breathable and comfortable.

As for collecting methane from astronauts' farts to power the engines, it is not a practical idea. The amount of methane produced by a human is relatively small, and the energy yield from that methane would not be significant enough to power a spacecraft's engines. Additionally, the collection, storage, and processing of methane from farts would require complex and bulky systems that would be inefficient and impractical in a spacecraft's confined environment.

Spacecraft propulsion systems typically rely on chemical propellants, which provide much higher energy densities than methane from human farts. Research in alternative propulsion methods, such as ion engines or solar sails, is ongoing to develop more efficient and sustainable propulsion systems for future space missions.
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