One in space other on Earth, two NASA twins are no longer identical
The case of two twins, one of whom stayed in space for a year and the other on earth, confirmed an early NASA thesis on the changes that human body experiences in the absence of earthly gravity and natural oxygen.
Scott Kelly stayed for 12 months at the International Space Station, while his brother was identical, Mark on earth.
When Scott returned through the Human Research program, NASA investigated changes in the organism that had occurred between two identical brothers.
What was proven was that the two identical-born twins were no longer such. NASA researchers analyzed Scott after he returned home and in the days of adapting his organism to earth conditions.
Some biological functions were immediately reinstated in their “normal” settings, identical to Mark, and others tried a few days, but what did not return more identically between the two brothers was DNA.
NASA researchers say the lack of natural oxygen, gravity, and root-change in diet affect genetic behavior. Scott’s telomeres, that is, the prolongation of chromosomes that shrinked over the years in terrestrial conditions, in the space were surprisingly prolonged. Two days after Scott landed, most of these telomeres were cut short again.
93 percent of Scott’s genes returned to normal, but 70 percent likely would take longer, maybe never will. It is here that NASA researchers are focusing on understanding the changes in the human body in space and how these changes can be made.
“Human Research” is the NASA program that studies the effects of space abyss in the absence of gravity in the human body, and aims to precede unexpected surprises in the event of a long spatial journey, starting with it for in March.