Future astronauts may grow some of their meals inside greenhouses, such as this Martian growth chamber, where fruits and vegetables could be grown hydroponically, without soil. CREDIT: Pat Rawlings/NASA View full size image

Most space fans hope that humans will eventually reach Mars. As for cows and chickens, that’s another question.

Animal rights group PETA (People for the Ethical Treaent a letter to spaceentrepreneur Elon Musk, founder of rocket company SpaceX, urging him to make any Space X missions to Mars vegan.

“We can get off on the right foot on our new biosphere by ensuring that Space X crafts traveling to Mars are stocked only with vegan food and that Mars’ colonists commit to enjoying an animal-free diet once they’ve arrived,” the group wrote in the Aug. 8 letter. [Space Food Photos: What Astronauts Eat]

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