The crew stays in space, even though many astronauts’ eyes return to normal after landing on Earth. This is troubling for the two because of their lengthy mission.
Their cognitive abilities may deteriorate as previously shown in some astronauts due to a combination of stress, sleep deprivation, and shifting brain pressures.
The biggest danger for the couple, however, is microgravity as astronauts’ muscles deteriorate over time in the absence of Earth’s pull,
Making it difficult for them to maintain a healthy weight. The two were unable to walk upon their first arrival on Earth, which is also explained by this.
They may have muscular atrophy despite their rigorous exercise regimen and high-calorie diet on board the ISS, which may possibly be a factor in their fragile look.
