HUMAN Health not greatly affected by Space Missions', NASA Twins study finds.

A study of the US astronaut Scott Kelly and his identical twin suggests human health is not significantly affected by longer missions to space.

Scott spent nearly a year in orbit on board the International Space Station between 2015 and 2016 while his brother Mark remained on Earth.

Using data collected from both men before, during and after the 340 day mission, US scientists carried out 10 separate investigations.

Their findings published in journal Science, detail the human health impact of NASA's longest  human spaceflight, with several changes identified in Scott which were not seen in his brother.

Some of the effects persisted after his time in space but many subsided in the following six months.

''Given that the majority of the biological and human health variables remained stable, or returned to baseline, after a 340-day space mission, these data suggest that human health can be mostly sustained over this duration of spaceflight,'' the authors wrote.

Studying the identical twins, who were 50 years old at the start of the study, gave scientists a unique opportunity to compare individuals with the same genetic material subjected to different environments.

Exposure to radiation, lower gravity, less exercise a restricted diet and disrupted sleep are among the possible risks of spending time in space.

Mark is a fellow astronaut and has also been to space before, but not for almost four years prior to Scott's mission.

''The twins study is certainly the most comprehensive view that we we ever had of the response of the human body to space flight, ''Professor Susan Bailey, from Colorado State University, said.

Blood samples, physiological data and cognitive measurements were taken from the brothers at regular intervals over 25 months

While Scott was in space, his samples were sent back to Earth with shipments that had delivered supplies by rocket to the ISS.[Agencies]

The honour and serving of the latest operational research on ''Human Health in Space,'' continues. 


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