Researchers sent frozen mouse embryos with a rocket to the International Space Station in August 2021. Astronauts at the station dissolved the embryos using a specially designed device and implanted them for 4 days. The scientists noted that "embryos that grew in microgravity conditions naturally evolved into blastocysts" The experiment "clearly proved that gravity does not have a significant effect" on the issue of mice breeding, the researchers said in a study published on the website of the scientific journal "iScience"