After astronauts enter space, if they stay too long, it is easy to cause gene mutation! Recently, NASA released the results of twins study. Scott, who lived on the international space station for nearly a year, has changed his cognitive ability and gene expression. According to the media, Scott's' immune system and DNA repair function 'has a mutation, which is a permanent damage that cannot be recovered, and similar reports emerge in endlessly.
NASA researchers have studied a pair of twins. One is Scott, who has lived on the international space station for nearly a year, and the other is mark, who lives on earth. With mark as a reference, NASA can study how the space environment changes Scott's body, but the premise is that the genes of the two brothers are still different.
Scott's genes have changed compared with his twin brother Mark, but these changes are not necessarily caused by mutations. Everyone's genes are different, even if they are identical twins. Scott's genome hasn't changed, but some genes have been actively used, leading to what appears to be a 'mutation'.
For example, if you live at high altitude for a long time, you will have more red blood cells in your blood. This is because hypoxia affects your gene expression, and your genes have changed, but there is no mutation in DNA.
The statement that "space causes human gene mutation and cancer risk" comes from the media's wrong interpretation of a NASA report. NASA later updated its research progress, but all of them were selectively ignored by the media. For the sake of popularity, they would not verify the relevant follow-up progress, which is also the biggest tragedy in the post truth era.