Questions for “Space travel may harm health by damaging cells’ powerhouses”
![a photo of Scott Kelly on a spacewalk a](https://www.snexplores.org/wp-content/uploads/2021/02/1440_space_travel_mitochondria_feat-1030x580.jpg)
After a year in space, astronaut Scott Kelly (seen here on a spacewalk in December 2015) experienced changes in his mitochondria — energy-producing structures in cells — a new study finds.
NASA