"Although those sperm had a little bit of damage by space radiation, the following offspring were all normal", Wakayama added.
This study also proves that since sperm can be stored in space, animal sperm can be used to reproduce animals, thus, making human existence more possible.
As the researchers argue, this is good news for any serious efforts to expand into space long-term.
He said the feasibility of mammalian reproduction in space beyond the Van Allen belt would depend on the creation of "radiation-hardened" facilities that could protect sperm, eggs and embryos from harm.
Still, there are limits to this research. Samples were stored in a freezer with a temperature of -95 C for nine months, before to fly back to Earth on the vehicle SpaceX-3. Considering the current technological limit for sperm preservation is only about two years, this seems fine - for now, anyway.
On the ISS, astronauts receive between 10 to 100 times more radiation that they do on Earth, and studies have found that the parts of the body most sensitive to the exposure are the reproductive organs. It appears that space radiation does cause DNA damage in the sperm, but do not affect fertility or health of future offspring.
The freeze-dried samples were launched in 2013 and returned to Earth in 2014.
Professor Joseph Tash at the University of Kansas agreed the study findings had limited significance for human reproduction in space.
Wakayama said it's likely humans would live in space for several years or more at a time in the future and would use technology to assist in reproduction and maintain the diversity of mammals. All the registered genetic differences between the two types of pups were also minor.
In space, living beings are exposed to much weaker gravity and intense cosmic radiation that can easily damage genetic material.
"I'm not surprised this sperm is fine", said Donoviel, according to The Verge. On Earth, we're protected by this radiation thanks to our atmosphere and magnetic field; the magnetic field around our planet, known as the magnetosphere, deflects or captures the incoming particles, and the ones that make it through are mostly absorbed by our atmosphere. "There are much higher risks in deep space". Still, it's unclear how partial gravity may affect a developing embryo, and we won't know until we test it out.
US astronauts on 'critical' spacewalk to replace power box
The other MDM in the truss is functioning perfectly, providing uninterrupted telemetry routing to the station's systems. Whitson spent the Sunday assembling and testing a new MDM, which will be installed during a two-hour spacewalk Tuesday.
WWE Backlash 2017 Full Show Preview: Start Time and Other Info
After a match between Natalya and Becky Lynch , Naomi , Becky and Charlotte were scheduled to face Carmella , Tamina and Natalya . There's a wild night in store for WWE fans on Sunday when Smackdown Live's Backlash pay-per-view emanates from Chicago.