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One thing that has yet to be tested is the propagation of the species. Will we, as we boldly go, be able to continue to reproduce, to grow new humans in the microgravity and radiation environment beyond Earth's atmosphere?For the first time, mammalian embryos have been cultivated and grown in space, aboard the microgravity environment of the International Space Station, orbiting Earth approximately 400 kilometers above the planet's surface.
But there are many different moving parts of a pregnancy, and so the team's latest effort was focused not on fertilization or implantation, but the early development of the embryo. The researchers fertilized mouse embryos and developed them to two-cell stage, froze them, and shipped them up to the ISS to be thawed and cultured by astronauts in a special machine designed expressly for the purpose.
The survival rate of both groups aboard the ISS was lower than the survival rate on Earth; but those embryos that did survive developed normally, the researchers found.
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