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Spaceflight is hard on the heart, yet artificial ones grow better in space than on Earth

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Spaceflight is hard on the heart, yet artificial ones grow better in space than on Earth
space science3 hr ago

Spaceflight is hard on the heart, yet artificial ones grow better in space than on Earth

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  • Space.com·May 3

    Spaceflight is hard on the heart, yet artificial ones grow better in space than on Earth

    Mini-hearts seeded with human stem cells grow better in space than they do on Earth, a new study shows. (Image credit: Sean Escopete/NASA) The human heart shrivels away in space, but researchers have found that mini-hearts grown from human stem cells sprout in space significantly faster than in labs on Earth.Weird things happen to astronauts' hearts in microgravity. Without the sense of up and down, the flow of blood in the body changes. More of the fluid gathers in the head, and there is suddenly less of it not just in the legs but also in the heart itself. Not having to push the body against the resistance of gravity, the heart shrinks, weakens and even changes its shape, becoming more circular."On one side, you have things that have already been made before that are being exposed to low gravity and potentially deteriorating and getting weaker over the course of being exposed to microgravity," Sharma said. "On the other side, you are actually making those things from scratch in space. It's possible that the production process is facilitated by low gravity."Sharma, who has been sending heart cell experiments to the ISS since 2016, presented the results of his team's latest

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Space.com

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May 3, 2026

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May 3, 2026

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